Overall, the four of us had a great time in Barcelona. This apartment was in a safe neighborhood and there were supermarkets and restaurants nearby. It had a nice tiny balcony which was perfect for listening to the vibe of the city. No outside noise came in if the balcony doors were closed. There were three bedrooms although I believe only the big one was in the original floor plan. The other two must have been added later and their walls were rather thin. However, that was not an issue for us. There was a lot of storage space. The apartment can accommodate up to 7 people (with two small adults or children sleeping on the living-room sectional. The only problem we had was running out of toilet paper on the third day at 11pm! Yeni said they only provided two rolls and the rest was up to the guest. I mentioned it to her and hope she will provide sufficient amount of toilet paper for future guests. We had to buy more the next day ourselves. I believe since toilet paper is a necessity and it is so cheap, providing several rolls of it should be a non-issue for a host.
Overall, I would recommend this apartment. From there to Palau Guell by taxi was under 6 Euro. To the old city, about 7 Euro. To the airport, about 26 Euro (using MyTaxi app).
We loved Barcelona and hope to go back soon.