The hotel offers everything you need at a competitive price. Although not near the tower (which most people will be in Pisa to visit) it's right next to the station.
We booked a shared bathroom room, the room was clean and had a sink, which was pleasant. If you're unfortunate with the other guests, your bathroom won't be as clean. They stick 6 rooms on one toilet/shower, so if it's busy you'll often find someone else using it. We were unlucky with one guest who apparently kept his dirty shoes on while in the bathroom, but the other days it was OK. Please don't be that guy on your holiday.
Breakfast was great for the price, and the staff were very friendly. The younger staff speak English very well, while the elder (proprietors?) don't - but still enough to help you on your way.
If we come back to Pisa we'll probably stay here, unless there's a better deal somewhere else in town.