Ive just bought some Sylvannian Familes bits for Dd whos also 3. I’m having as much fun as she is playing with it!
The thing I like most is that there’s tons of bits, but you can stick to a traditional home without all the gubbins if you want to. But they have some excellent accessories (tiny waffle maker that opens and has removable tiny rabbit waffles!)
We have a le toy van cottage that came with furniture, can't speak about longevity because we haven't had it long but it looks like it'll last. It's a nice size and I can see it remaining longer because it isn't huge and taking up loads of space.