Pepo's apartment is really unusual and beautiful and exactly as it looks in the photos. One of us slept in the main bedroom and the other on the sofa (which is actually surprisingly comfy). The apartment is well stocked with towels, bedding etc. We didn't have any problem at all with noise. The location is brilliant, La Sagrada Familia is literally a few minutes' walk - handy as we didn't get a chance to book online so got up to queue at 8am (note to future visitors - would advise booking online before you travel if possible)! The nearest Metro station is also located here.
We only met Pepo briefly when we arrived but he was very nice and welcoming - reassuring when you are coming to an unfamiliar city! He showed us round the apartment and also highlighted some places on our map for us to visit.
We would highly recommend the Gaudi Bakery just down the road, a very friendly relaxed place where you can get lovely coffees and sandwiches, crepes etc. Anauco Hamburgueseria just round the corner also does incredible burgers and the staff were very friendly.
One final note to add is that it actually took us 40 minutes (not 15) to walk to the beaches (down carrer de marina) but Pepo may know of a quicker route...
Overall, we had an amazing time and would definitely recommend staying in this apartment, you will not be disappointed. Thanks Pepo!