I didn't actually meet Valentina (self check in) but we were in contact before and during my entire stay. She answers promptly and has a tip or a solution for everything, she even anticipates all the needs so you don't even have to ask them (restaurant recommendations are displayed in the room, local information is provided in her first message etc.)
I lived in a small attic room with private bathroom just above the kitchen. It was clean and had everything I needed. The WIFI was also great.
The apartment is located 10 minutes (max.) from the train station Santa Maria Novella and you are basically in the old town. In my opinion it was an excellent value for the location, the privacy and the hospitality.
Can't think of anything I that really bothered me. I could stay there for much longer than the 4 night I actually did.