If there is no definition yet of "a perfect host", then i am sure Montse can be set as an example! She is very communicative and helpful, responded to my messages almost immediately, and was truly an amazing host.
The place itself matched the description perfectly - great room with a very comfortable big bed and a peaceful balcony. The location is also very convenient since it takes you around 10-15 minutes to get to Sagrada, or if you want to explore the rest of the city the closest subway is also 10 minutes of walking.
Don't hesitate with Montse, you will not regret your stay at this great place :)