Hi,
I'm an owner at Vistana.
I would not consider any of the villas to be stinky. Some are definitely older than others----less modern than the newer sections.
As an RCI exchanger, you won't have much choice where you are placed, but it may help to request an area via the online Diamond Lane form :
https://www.svosecure.com/starwoodvo/diamond.jsp?resortID=5
Nothing is guaranteed as far as requests go.
The Cascades and the Lakes are the two newest sections and are the only buildings with elevators.
I own in the Fountains I/II area which is next newest after the Lakes.
Just stayed there in August. ...
Can you see fireworks ? Only from select villas. I've got glimpses of Epcot fireworks, but really just the lighting up of the sky. I have had a view of Planet Hollywood in DD from one of my villas one year. Overall, from most areas, no you will not be able to see fireworks.
The resort is very large and strongly recommend having a car. It's perhaps a 10 min drive to the wdw parks and maybe 15-20 to Universal/Sea World.
If you have any further questions, please feel free to ask.