My girlfriend and I stayed here for a full month. The location and size of this apartment can't be beat! The wifi was great which was very important to us for remote work. The hosts were super responsive to our needs. The neighborhood and proximity to Mont Juic are awesome. Skip the pintxos on carrer Blai and instead eat at ZAZA - CUINAIVI, Napoli Centrale, Casa Xica, Cactus Cafe, and Raposa! TRUST ME.
The basement apartment air can be stuffy but isn't so bad if you keep the windows open. This definitely has the vibe of an old family house so the furniture is on the older side and the beds are very stiff. Don't expect a spotless hotel experience. Overall, it's a solid place to stay in Barcelona!