We loved our stay at the Treehouse! It's exactly as described - picturesque, memorable, serene and comfortable. The pool and the grounds were beautiful. It's so rustic. Our host brought us delicious croissants in the morning.
If do plan on spending a lot of time in the city center, I recommend planning ahead for the 20-minute taxis (about 25 euros). Our host was so helpful in calling taxis for us.
We were only able to spend one night there, however I wish it were more! We wanted to fully enjoy both the countryside setting of the Treehouse property and the wonderful city center of Florence. If you can stay for a few nights - so worth it!