We (four of us) stayed 3 nights and celebrated two birthdays. The apartment is very well located for the main tourist sites of Florence, and for shops, restaurants etc. The main train station is 12 minutes walk with a wheelie suitcase and the bus station is about 16 minutes. The apartment is very well kitted out for 4 people with quality appliances and an excellent modern bathroom. The air conditioning is great. The best feature is a small rooftop terrace. Great for breakfast as long as it is taken early before the temperature rises too much. A top tip is to skip dessert at the restaurant and walk back to the apartment via GROM, an excellent ice cream shop just around the corner from the apartment. Buy a 500g tub with 3 or 4 flavours (only costs 10 euro) and head up to the rooftop terrace with 4 spoons and a few drinks - heaven!
Lastly, Stefano is a perfect host. He is there to greet you at the start and responds almost immediately to requests for information. Overall I thoroughly recommend this apartment if you are visiting Florence.