Excellent place to enjoy this beautiful and amazing city of Florence. Perfect location close to every single museum or historical site to see. You can go by walk but also it is easy to get buses. Taxis arrive in 2 minutes if needed. Around you find restaurants, bar wines, shops... everything. The flat is very clean, nice and equipped with everything you may need. Guido is a very nice person, available, always on time, easy going but very respectful. I recommend this place and if I come back to Florence I would try to stay here again.
IMPORTANT: I have to add another comment after arriving home. A potential Guido's guest may be interested: I left my camera in a taxi when I left Florence, I contacted Guido from the airport to tell him, just in case, and he managed to get the camera from the taxi driver (a honest person too) and ship it to me!! Isn't it amazing? This is a real proof that not only you will have a great stay in Florence but that you can trust Guido (and the taxi drivers!). I couldn't help to share this experience. It is worth! I love Florence.