Great place in a great location. Stefano was an awesome host (and his sister was really sweet too!).
The proximity to Santo Spirito square was one of the best things I enjoyed--a really good vibe there with a ton of solid restaurants and bars. Being in the Oltrarno neighborhood was perfect, in that, you're away from all the madness, but walking distance if you want to check out the Duomo.
House itself was nice and as described. It got cleaned once a week which was awesome too. I would say it's the ideal size for 2 people to live comfortably. Having a washer was a plus as well. There's an elevator in the building too in case that matters, but I didn't really use it much.
Overall, I would stay here again in a heartbeat. Perfect long-term accommodation for anyone.