Marcel & Marta’s place is absolutely wonderful. It is larger than what it appears on the photos. Sweet bedroom nooks and a lovely balcony is what I liked the most.
Double windows do help reduce the street noise. The local underground metro passes by every 5-6 mins so you will hear slight noise and feel a bit of “rumble”, but after a few days you get used to it.
Location of the apartment was very suitable for all our walking adventures(100km/62miles in 6 days): Park Guell, La Sagrada, La Barceloneta, Mont Juic, etc. and it was very easy to get around.
Highly recommend their place to anyone who would like to get the feel for the local side of Spanish living tucked away from busy touristy locations.