We only stayed in this hotel for one night but found the quality of the rooms to be very good. The wifi issue detailed on other posts wasn't a problem. The service however was. Our airport transfer was booked for two hours later than we needed and they failed to help when booking a taxi. The general feeling I had from the reception was that they were lacking motivation.
This hotel is good for the odd night however if you wanted to stay in Pisa longer I would find a more central hotel. It is a 15 euro taxi to the heart of Pisa.