We stayed at the Cabins in April of 2011. We enjoyed it. We had three adults, one teen, and two younger kids. It was a little crowded at times with just the one bathroom, but with only 4 people, you should be fine. Housekeeping was excellent. They even loaded and ran the dishwasher for us -- which I totally did not expect.
We rented a golf cart from FW and were glad to have it. It was nice for getting around the resort -- pools, just looking around, seeing Easter decorations, getting to HDDR, etc. It's kinda spendy, but it was a nice treat for us. My DD, who was 16 at the time and fully licensed, was able to drive the kids to the pool, to see the horses, whatever. The bus transportation was perfectly fine however. So don't be worried about that. Just take an internal bus to the Settlement or Outpost and you'll get where you need to be. They'll give you a nice map with the routes clearly identified.
We used to camp when I was a kid and this reminded me a lot of those times. We've traveled to WDW with my parents, but stayed at POFQ and other moderates. I think they'd have enjoyed FW more. Now I know and I'm trying to talk them into another trip.
Finally, we also ordered from Garden Grocer and were very pleased with the service. I'd ordered from them before when we stayed at SRR and BWV. They called about an hour before they'd be at FW to say they were on the way. I asked if we needed to be at the Cabin and they said that wasn't necessary. They delivered everything to the Cabin. Put all the refrigerator/freezer stuff away and left the other goods on the table. It was great. (I did tip in advance.) Much easier than renting a car and going shopping ourselves. Heck, we were having fun at DHS when they called.
Okay, one more finally -- someone on the Disboards recommended Loop 2500 to me, so I asked for it. We were assigned to that loop and it was perfect. We were very near the quiet pool that also has a hot tub. Even though it was a busy time of the year, it was like we had our own pool and hot tub.
Have fun!