Firstly I have to comment on how incredible our host Ludo was- quick to reply to any questions, very supportive, lots of useful tourist information.
The apartment itself is clean, comfortable and spacious with all amenities (fully stocked kitchen equipment, wifi, TVs, heating and fans in all rooms). The location of the apartment is a quiet street near Parc Guell, this area has lots of hills but the street leading to here has outdoor escalators which makes it a lot easier. We spent our first 2 nights in the gothic quarter and didn't get any sleep from the noise- Ludo's place was a dream in comparison! Public transport is about a 6-7 min walk away, and from there it takes approx 10 min to get to Las Ramblas. Plus the tourist buses have a stop close by here. There are great cafes, shops and restaurants also within approx 10 min walking distance. It was a perfect place for 3 of us to stay for a conference in Barcelona as the same Metro line took us to our venue within 20 min. I will definitely be back to stay here :)