Carmine is a really nice host - very flexible and with good suggestions for example for restaurants to eat. But it might help to gather also some brochures about places to see or with tips for tourists coming to discover Florence.
Carmine's place is very well located, very central, close to all the 'must-see' places, but a bit loud because of that. Carmine rents several rooms and it was nice to meet other travelers there. The place is large, with basic comfortable furniture and it is clean.