Opera B&B is an excellent choice if you're staying in Florence, being close to the main bus and train station (10 minutes walk, or a 3-minute bus ride from a bus stop across the street), and a short walk to the main sights of Florence (slightly more than 10 minutes to the central market, and the beginning of the old town).
The host, Francesco, is amazing and is so helpful in providing advice on what to see, where to go, what to do, so that you're time in Florence is memorable and thoroughly enjoyed.
The breakfast is more than enough to provide you with an excellent start to your day, with cereal, fruit, meat and cheese, choice of teas and coffee, croissants, sweet cake, juices - it's excellent!
Francesco helped us book a day tour around Tuscany, and also helped us sort out our transport to Pisa airport for our return home, including booking and printing our bus tickets.
If we are to stay in Florence again, we would not hesitate to stay at Opera B&B again.