Donato is a very nice host (ask him where to dine in Gracia!), the place is very good, right next to Park Guell and very close to all the fun happening in Gracia. It is very close to metro, so in 10-15 minutes you are in the touristic center. Even though I had to go to WTC the opposite side of the town everyday, the way was always pleasant.
The room itself has a great ambiance, it's very bright and even when it's hot it gets well ventilated thanks to the door to the balcony. One can close the blinds at night to avoid the street light coming in at night, but you don't want to do that as the air is great and the music coming from somewhere is always good and not loud (as well as passers).
Donato's cat will never bother you (though I'm a dog lover and owner and cat's hate me), he never comes to the side where the room is.
If you are not fans of fancy hi-tech hotels but rather authentic feel, this the right place for you! I would stay at Donato's place again whenever I go back to Barcelona.