We had a great time in Barcelona. Diego is super nice person and wonderful host. He was very welcoming and always there for us when we had questions related to the flat and Barcelona in general. The apartment is nice as well, with everything you need for a longer stay, and the neighbourhood is lovely! There are a lot of bars and restaurants, but it's not touristic. It's a walking distance from Montjuïc hill and short bus ride to main city beaches.
We plan to come back!