Lorenzo is a great host, he tries to give us all the support we need.
He has 5 rooms with bathroons inside and one extra room with exclusive bathroom, but outside the room. I stayed 3 days in room #2 and 6 days in the extra room.
Room #2 is very simple but convenient if you, like me, intend to stay the minimum possible in the hotel. The window is small though, and it feels not well iluminated.
The extra room is big, with 2 floors like in a studio, the window is ample and it is well iluminated. The outside bathroom is big and also very well iluminated, very good bathroom. Despite this room not having an internal bathroom I think it is a better deal as both the room and the bathroom are bigger and more comfortable.
The rooms are in the 4th floor, no elevator. This can be inconvenient when you arrive tired, but I didn't feel it as an important inconvenient.
There is a supermarket on block away, coffee shop 10 meters away, bike shop (with rental) right in front, several restaurants in the same block and it is close from the main points of Florence.
I think Residenza le Rondini is a very good value for money and would definetely recomend it.