The appartment from Marco and Anna was right in the old centre of Florence in an old house. It is a lively area but the appartment is amazingly quite though. It is really fun to step out of the front door and find yourself immediatley in te old town, less than 2 minutes from for example piazza della signoria and Palazzo Vecchio, Duomo is a five minute walk. The appartment has 3 spaces: kitchen/living and two bedrooms, all equipped with very good airco. For two people it was spacious. The excellent bathroom can be reached via one of the bedrooms. As indicated by Marco, it is a bit of a climb, 96 steps up the stairs, but for us it was doable (get some exercise :)). The supermarket right next door is very handy and quite big.
Marco is a great host, for example providing us with some food and drink when we arrived late in the evening.