Maria and Oscar were excellent, I communicated with them via email prior to my trip and they always promptly replied. I requested a taxi be booked from the airport, within 15 mins a confirmation text was received from the taxi firm. They were waiting at the airport and were exceptionally curteous. A friend of Maria met us at the apartment and showed us around.
The description of the apartment was 100% accurate, the only thing that wasn't clear was the two of the three bedrooms were ensuite and the other used the main bathroom.
Location, as described, we were about 200m from the top of La Ramblas.