I haven't stayed at BLT, but I can tell you the one bedrooms at the newer DVC's (we stayed in one at the Grand Californian at
Disneyland in CA) are beyond nice with the two bathrooms. Even with just two of you in there using the bathrooms, having two is priceless. While the decor may not be the warmest, that set up of those one bedrooms will spoil you!
All Disney resorts get bad reviews on Trip Advisor. I like TA and use the site and always put my own reviews on there after our WDW and DL stays. However, I find many TA users are all about the "what you get for your money". Many people like a resort fine, but since one of the critieria for ratings is for value, they honestly put that for the money it wasn't a great value. That brings the overal reviews down. Bottome line, many people who post on TA stay at Disney rarely or just once and they compare Disney resorts to other chains and can't over the "no free breakfast, no free wi fi, small rooms, high prices" issues and find them lacking.
To me and most other Disboard regulars, Disney resorts are so in a class all their own, that the issues that make them rate low on TA, don't bother us!
You will love the one bedroom, the closeness to MK and all the nearby dining at the other monorail resorts.
Say no more about needing your own unit, I loved my fil dearly but when we went to WDW with him, I spent more points and put him in a studio next to our unit, no way could we share. We had a great time because we had our own space!
Have a great trip!