I've stayed at Rinascimento before, about 2 years ago. It's the most amazing place to stay. The building is beautiful with stunning features such as ceiling murals, and it's positioned perfectly, within easy walking distance of museums, shops, restaurants, a great gelateria and, of course, the leaning tower area. The station is about 20 minutes walk, but both taxis and buses are available.
Breakfast is very special, with freshly sqeezed orange juice, beautiful eggs and crispy bacon and the normal continental selection. I'm coeliac and Andy had made a wonderful gluten free cake for the first morning and a different one on the second. There was also a wide range of wrapped gluten free items to choose from.
Andy and Andrew are lovely hosts. They're very helpful and friendly. If I get back to Pisa I wouldn't stay anywhere else.