Really, any hotel is fine, it's just about your preferences. We stayed at the GF when my daughter was almost 3 months old, GF and AKL when she was almost 4 months old, ASMu when she was 9 months, and we'll be at AKL and CR in April, when she'll be almost 14 months.
When we stayed at ASMu, I was alone for 3 days of the trip (my husband could only come for the weekend) and I managed fine with the baby, stroller, and diaper bag by myself. And at ASMu you have to bus everywhere, so it was managable, not preferable by yourself, but doable. I wish we had the resources for me to have stayed at CR that trip cause it would have been much easier to just be in the building and be 'home' and walk or take the monorail to parks, but wasn't possible at that time and I was fine.
I will add though that the monorail resorts are especially nice with the stroller, as would the BW area be because of the ability to walk or take the boat. It's nice not having to fold the stroller! It can't be too bad though, or we wouldn't be back at AKL where it's buses only! Have a great 1st trip with your son!