We stayed three nights in H10 Madison and it was really great. The location is excellent for tourists. In the Gothic Quarter, close to the cathedral and Placa Catalunya where you can pick up hop on hop off bus tours.
Rooms are really nice and the a/c and ceiling fans keep things really comfortable.
The Terrace is a great place for drinks and snacks.
The real positive about this hotel are the staff. Very helpful and super friendly. They really seem to care that their guests have a great stay.
I highly recommend this hotel for a vacation stay in Barcelona.