Hotel Soggiorno Athena is located 100 meters from the bus stop to the airport and the central train station (20 minutes to the airport, 10 minutes to the central train station) and less than a 10-minute walk from the Square of Miracles, where The Leaning Tower of PIsa, The Cathedral, The Baptistry and most of the other major Pisa attractions are located.
The location is amazing, and the hotel itself is quite nice for a 3-star property. The rooms are not big, but they are maybe 4 meters high, so you don't feel any lack of space. Bathroom cabins are quite small, but still comfortable - as everything else in the bathroom.
There is free wifi (not great speed, though, as usually free wifis are), decent breakfast and a very friendly service. Cleanness is at a very high level.