Impressive!
We recently stayed at AC Hotel. The hotel is not located right in the center but in an urban are called Cisanello. This area is a quiet area but it is not too away from the center. The famous quarter Piazza dei Miracoli with the famous "Leaning Tower of Pisa" can be reached within 25 minutes walk. For those who do not fancy walking there is a good transportation network. The hotel itself is nice and the accomodation is comfortable with satisfactory facilities. Breakfast was adequate. Atmosphere was warm and inviting. Staff were all nice and helpful. We had a very pleasant stay at AC Hotel Pisa for really good prices.