Had a group of 5 and only stayed for one quick afternoon and evening before hitting our flight home.
But it was great! Eddy- could not have been more responsive! The location- perfect; tons of restaurants, bars, shops, sights right out the door. And the place was gorgeous, clean, well decorated and had a cool vibe.
The only negatives were the stairs (only because I had an older traveler) and the noise of the neighborhood - but the windows did a great job of dampening street noise.
Overall, I highly recommend it and can't think of a better place to call home while exploring Florence. I'd say it's perfect for a group of 4-6 younger people.