My husband and I spent a few days in Florence (for our first time) and staying at Sumiyo's apartment couldn't have been a more wonderful experience for us! It's in an excellent location, slightly away from the busy, touristy parts of Florence with a taste of how some of the locals live. It is also conveniently situated several minutes from Ponte Vecchio making it easy to get to all the major sights.
Sumiyo is an excellent host! She is prompt, responsive, and genuinely caring to her guests' needs. She met us and greeted us warmly while giving us a tour of the apartment and provided us with suggestions for things to see and restaurants to go to. She even saw us on our way out the day we left making sure we had everything properly arranged for our departure to the next city.
The apartment itself was amazing! Again- the perfect place to retreat while spending a few days in Florence. The apartment is lovely with a good mix of old Florentine-style along with a modern finish. The kitchen provided enough for us to cook a meal (with groceries we picked up from the nearby market). It was comfortable and beautiful despite the noise and distractions of the construction going on in the street down below (this didn't bother us much though as we were out and about most of the day anyway).
Overall, we highly recommend Sumiyo's place if you're looking for somewhere to stay in Florence. Sumiyo is wonderful and her apartment is excellent! We would definitely stay again!