We have stayed at Andrea and Valentina apartment with my husband for 2 nights as a part of our Tuscany trip. The flat is in the heart of the center, e.g. Duomo (Santa Maria Firenze) is 5 min walking distance. The flat itself is wonderfully decorated and stylish, we had also our own bathroom during our stay.
Andrea and Valentina are very nice and are willing to help and to direct you if needed. Overall I would recommend to stay at Andrea and Valentina place.