We stayed in the San Frediano flat in January 2016 and had a very good time. Very well located near the beautiful Piazza Santo Spirito, the flat is clean, fully furnished, cosy and welcoming.
Astrid/Leila were very easy to contact and always willing to help or give good advises. The only minus-point is the lack of Internet connection but I guess this will soon be done. All in all a simple but very nice place in a great area with a caring, kind and helpful host. I would definitely come back and recommend it to visitors.