The nicest hands down 2BRs right now will be Riviera simply because they have been open 8-9 months so far and are brand new. They also are if I remember 2nd largest at WDW as far as size goes (VGF is like 4th).
Animal Kingdom was fine when we visited last year but I would watch a video room tour as some people might not like the style. Also you have an issue with transportation (IMO) and with Kidani you don't really have a full onsite quick service its over at Jambo which could still be closed (haven't been following it).
I would cross off SSR simply because its not near the parks and yes the new rooms are supposedly to be lovely but you are going to Disney.
That leaves BLT (little more bland), BRV (which is "dated"), and VGF ("nicest" resort at Disney with great rooms)
- VGF
- BLT
- BRV
- AKV
- SSR
In that order but would give RIV the nod over all of them for the room category. VGF would win for the resort as a whole vs RIV.