Tommaso's place is very convenient and well suited for large groups. It's about 15 minutes walk from the Dome and 5-10 minutes from the Accademia (David statue). The apartment was clean and all the appliances worked great! Our group packed light clothes-wise, so it was great to have a nice washing machine at Tommaso's place to do laundry. A couple things to know before booking:
1) There's 1.5 baths instead of 2. For our group, this meant that 7 people had to share 1 toilet, which was sometimes frustrating.
2) The A/C wasn't on for the duration of our stay, but Tommaso does provide fans. I imagine this could get hotter during the summer months (late June, July, August), but for us, it wasn't a big problem.
3) A general note about Florence: mosquitoes seemed to be pretty prevalent here. So if you're going to open the windows to cool off the apartment, consider bringing bug repellent.
Overall, Tommaso's place provided a good home base for touring Florence, and I'd likely book it again if I was in the area!