We stayed at Marta & Paul’s place for a long weekend before Christmas.
Location couldn’t be better, just next to Plaça de Catalunya within a very short walking distance to many of the attractions in Barcelona. The apartment is comfortable and clean and the two bathrooms is a big plus. The third bedroom with the single bed is located at the back of one of the other bedrooms so you need to walk through that bedroom in order to get to the other. For us that wasn’t a problem.
The subway rambling that was mentioned in the other comments is very subtle and didn’t disturb us night.
Overall we had a great time in the apartment and we highly recommend it.