I stayed with a friend at Casa Tortilla and had a great time. The apartment is just two blocks away from Sagrada Familia, relatively close to Park Güell, as well as about 20 minutes away of El Gótico on foot. The house was clean and comfortable. Kitchen was great and has everything you might need and more. My only complaint is the WiFi, which at time was too slow. However, as I work remotely and had to work for a couple of days during my stay, my need of a good internet connection are probably higher than someone who's just vacationing, so for most people it should be just fine. 100% recommended.