We stayed two nights in Florence at Nicola's apartment and had no issues. Nicola was great during the key exchange, and was easy to connect with via email (and text when I didn't have any wifi access). To get up to the apartment, one must climb a circular staircase (which was just barely possible with my smallish suitcase - careful if you have a larger one!) and the apartment itself had a nice sized kitchen and bedroom.
Grazie Nicola e Chiara!