Everything was really good! The place is cosy, modern and nicely-equipped. No problems with communication at all, Maria was really cheerful and helpful and did her best to make sure that I had everything I needed. I definitely recommend staying at her place.
The only thing that you may want to consider is the distance to the city centre. I didn’t mind because I am a walking freak and there is a metro station and a bus stop nearby (like really nearby) but it takes around 30 minutes to get to Plaça de Catalunya, but after all you can't get everywhere within several minutes in a city the size of Barcelona so I wouldn't consider it a major disadvantage.
The neighbourhood is nice as well, you won’t see many tourists there so you can feel the more local vibe. Riverside park just around the corner, lots of places to walk and escape from the bustling city.