My husband and I stayed here for 4 nights and it was perfect. Irene is a great host. I didn't get to meet her in person, but she made check in easy, and the instructions inside her place are very clear. When needed, she was quick to respond.
Like other reviewers have said, this place is very clean and I felt comfortable in it. It is also small. 2 people max for sure. The shower is especially tiny, and may be uncomfortable for bigger people. This place would also not be the place for you if you don't like stairs, since it's on the 4th floor without an elevator. I just considered this bonus exercise for all the gelato I was eating :) It's an excellent value too. Also, there's an amazing Italian restaurant only about a block away called Trattoria Accadi. Really great location overall. We walked everywhere, never needing a taxi or public transportation.
I would absolutely stay here again next time in Florence.