This was probably the best Airbnb experience from our entire Eurotrip, which includes Paris, Cinque Terre, Rome, and Barcelona. Although Tommaso was not there to check us in, his mother (very nice lady) was able to let us in early to drop off our bags.
Tommaso provided very detailed instructions and made it a very smooth process. The apartment was incredibly clean and included a multitude of well thought out amenities that gave it the perfect touch. We were next door to the Mercato Centrale (nice market filled with different eateries and specialty shops) and a stones throw from our favorite place for Bistecca, Trattoria Mario. The rest of the Florence sites are easily reachable by walking. Be sure to hit up all'Antico Vinao for some incredible (and cheap) paninis!
I would recommend to practice with the middle door (you need to get through 3 doors to get into your apartment), which was a little tricky the first couple of times. The fact that Tommaso's mother lived next door coupled with the many doors that you have to go through to get to the apartment, was enough to make us feel incredibly secure. The only caveat is that the bookshelf type stairs may be difficult for some elders and those with disabilities. The height of the bedroom (around 5'5 in or ~165 cm) may also be a problem for taller individuals, but I feel like that shouldn't even deter anyone given the rest of its wonderful aspects.