We just got back from 5 nights here for the first time. I am sure some of these have been addressed but I thought I'd just jot them down here in case it helps someone!
Von's does deliver. DLH staff even carted up our groceries for us since we got the free case of water (which we used up entirely) and paper towels (which were very useful but we had lots left over) for being new to sign up for Von's delivery (we tipped them). We did not test out the "hotel staff will keep food in a cooler until you pick it up" though. We were there when the groceries were delivered. I actually wouldn't recommend trying it - the bell stand was BUSY ALL THE TIME and I wouldn't trust that the staff would be able to make sure your food stays cold. Just schedule the delivery time for when you will be there.
The "dorm fridge" is SMALL. Smaller than an average dorm fridge, I would say. But, incredibly useful. Here is what we were able to fit (and not much more will fit):
- 1 half gallon of orange juice (there is space for a single half-gallon carton in the door)
- 1 half gallon of grapefruit juice (laid sideways in the main compartment)
- 1 quart of milk (in the door)
- Pack of salami
- Pack of snack cheeses (to go with salami on crackers)
- small tub of hummus
- package of baby carrots
The freezer is big enough to stick 2 of the SMALL freezer packs, but not much else. In addition, we got a bunch of non-perishables (granola bars, cereal, bananas, apples, crackers) and saved a bunch of $$ on breakfast/snacks. We even made a dinner out of the carrot sticks, crackers/salami/cheese, and fruit on one night. Don't forget to bring things like disposable bowls and spoons (paper towels double as plates). We forgot those things and therefore couldn't eat cereal with milk. If you're traveling with young kids, I'd throw a stack of plastic disposable cups into your suitcase as well - for brushing teeth and for rinsing hair in the bathtub, etc. The room only has 2 paper coffee cups that will fall apart in the bath, and 4 glass cups which you don't want your kids using for teeth brushing at the granite countertops/sinks!
We were in the Adventure tower (by request), park view, 9th floor (I requested a floor on the higher levels) and had a FABULOUS view of the fireworks which was great becaues the kids were so tired they were already in bed, and we could just wake them up to watch and then put them back in bed! We could also see WOC, though only the higher jets of water and of course not the music

Also, there is lots of live music in DTD that you can totally hear from the hotel. They will play music well into the evening...until 9 or 10pm. So if this is a concern for you, consider rooms facing the pool instead (though I bet you'd still be able to hear it somewhat). Our kids were so tired it didn't matter. And, I was pleased with how well the sound insulation of the rooms was. The doors are heavy, and walls seem thick. We didn't hear a peep from anyone else during our stay, and could only hear crying babies when out in the hallway. It was so nice!
We had a room with the pull-out and 2 queen beds. Nice size room for two adults and two 4yos!! Anything smaller would've been too small so I am glad we chose DLH over the Grand Californian. My only beef was that there was no small breakfast table and chairs so us adults ate breakfast on the sofa while the kids ate breakfast on the floor. If you're a germaphobe, go downstairs and grab several pool towels to sit your kids on the floor for meals and snacks. That worked great.
We ordered from Marri's one night. It was OK. I wasn't a huge fan of the pizza - the crust is really thick and dough-y and therefore one personal-size pizza is HUGE. We ordered way too much food.
We were able to swim in early February even though it was "only" in the 60s. Plan to swim in the middle of the afternoon when the sun is highest/hottest if you go during the winter months. Anytime between noon and 4pm is good because the sun keeps things plenty warm, and the water is heated enough to be comfortable - we all got into the pool and had fun. As soon as the sun STARTS to go down in the late afternoon, things get chilly really fast. That's when you head over to the hot tubs

We saw people swimming at all hours of the day, including first thing in the morning and late at night (which would've been too chilly for me, but for those wanting to swim laps for a work-out while the pools are not crowded, it's totally do-able). They do close the slides at the shallow play pool early. I think 5pm? They close the big pools at 10pm I believe. No idea when the pools open but we always saw people in the pool as we were leaving around 8am to get to the parks. The pools are worth staying at DLH
They DO NOT have stepstools and do not offer them any more because they have been deemed a "safety hazard". We were able to make do because the girls figured out how to use the bottom shelf (where extra towels are stored) as a kind of "step" and climb up well enough to reach the sink for handwashing so that we didn't constantly have to help. Turning a trash can upside-down wouldn't have worked well. So if this is a big deal for you, consider bringing a folding stepstool.
Anyway, we'd totally stay here again if we splurge on hotel in the future. It was a great stay and picky DH was happy about it too!