Edu's apartment is situated in a very convinient location, just a couple of squares from Plaza de Catalunya, with everything you need just around the courner (coffee shops, restaurants, supermarkets, etc).
When we first arrive to the apartment, we noticed that it was quite different (not in a good way) from the pictures published here (no small sofa or table at the living room, different dining table, fewer decoration, different floor), so I guess a little update would be very helpful for future guests.
The good things: Very close to the main attractions of the city center and well connected to the public transportation. The apartment was super clean, is very spacious, has a beautiful and very comfortable bathroom, and has every appliances that you'll need to make yourself at home. The city was quite cold when we were there, but the heater worked very well and the apartment remained warm at all times.
The bad things: Veracity (mentioned above). Noise; even though the apartment has a very good location, it faces a big street, so there was a lot of traffic noise during the day and part of the night, which ment sleeping very hard for us. Also, its in front of a dance club, so during the weekends it gets very noisy at night as well. This was quite an issue for us, and we noticed that the apartment is equiped with very good windows, but a little advice would have been very helpful in our decision (light spleepers), or even to be better prepared for this situation.
Overall, the apartment is still an excellent choice price/quality.
We didn't get to know Eduard in person but he was very responsive at all times, also writing to us to make sure if we needed anything and that we were having a good stay at his place. Also gave us some very good recommendations of restaurants and coffee shops.
We would recommend Eduard's place to almost anyone (not light sleepers) who's visiting Barcelona for the first time and wants to be in a walkable distance to the main touristic attractions in a very nice neighborhood.