The house is old and beautiful. You will have to climb 2 floor stairs but we did not have any problems with that. Naike is a wonderful host with absolutely clear communication. The place was clean with good kitchen and bathroom.
The house is just besides train line so you may get disturbed by the occasional train, we did not have much issues as are accustomed to it at our own place which is near train line. Also you will have to walk quite a while to avail public transport, though Florence is a small city and you can explore places walking, which we did.