The house is amazing, smack in the middle of the busy Plaza de Espanya square where you can take the trains, metro, buses etc anywhere you want to. The window of the room I had was facing an alley, though, so I didn't get all the noise of the square. Since I stayed in winter, there was a heater and tons of blankets so this was very comfy. The kitchen is very equipped with anything you'd need to cook etc. The vibes are great here, with tons of decorations, art, a big living room that you can use to watch tv or listen to the boys play their instruments. However, don't worry about noise because they can partition off the common area and you won't hear anything from the bedroom (at least from the spacious room I had). Only downsides, I couldn't lock my door when I wasn't there (but could lock it from the inside when I was sleeping for example). They use a lot of incense in the home, which I personally love but can be a downside for some. However, this is Spain so that's pretty common!
The boys that live there are lovely and very communicative in person as well as via the app and WhatsApp etc. They know great local places to check out and also how to get around. I was staying for a business trip and thus didn't do much exploring, but still I quite enjoyed staying here and would even more recommend it for someone traveling, since your experience will be even better. Enjoy!