We spent one week in Barcelona at Mònica's apartment. Our stay was very pleasant. We really enjoyed the city views from the balconies. The communication with Mònica always worked out well, she is a very helpful and friendly host.
I highly recommend staying at her place. The only downside I could tell is that during summer, the flat can get very warm despite the air conditioning located at the living room. Specially, the bathroom and bedroom. Finally, the elevator is a bit noisy during the day and also during the night. Nevertheless, it is a lovely place to spend your holidays in Barcelona.