My fiancé and I stayed for five nights in this room and that was a big part of our great experience in Florence. The room is well located, close to central train/bus station and the historic center, so you can easily walk to the main points of interest and take your transportation to other cities. Note that the room is in the third floor of a building with no elevator, so this might be a problem if you have mobility disabilities.
The room and ensuite bathroom are in an apartment with another room/bathroom. This means you share the kitchen, mezzanine and hall if there are guests in the other room (but in six days, we only met other guests once). Having a washing machine available was very convenient. In the bedroom, the shower is good, the bed is comfortable, and you have plenty of room to support your things (a wardrobe, hangers, a chair, a coat rack).
All the areas are beautifully decorated and create a very cozy atmosphere that make you want to stay home a little longer than you'd usually do while on holiday... During our trip we meant to prepare breakfast at home: in this apartment, doing so was a pleasure!
Communication with Guido was very good all along, both via the Airbnb app and in person. We met him twice (when we arrived and a couple of days later) and had a good chat about work and traveling. He's a really nice guy.
We highly recommend this place!