I highly recommend staying with Tadzio if you are visiting Barcelona -- especially if you are traveling solo like I was. He was very helpful, hospitable, and friendly. Tadzio's dog, Enza, was sweet and respectful, too.
The flat is in an unbeatable location, just blocks away from the Metro and in a fantastic neighborhood. Gracia is full of terrific restaurants and bars, and it is a beautiful place to meander along the narrow streets.
If you are looking for a clean, quiet place to stay in one of Barcelona's best neighborhoods, this is the place.