We were 6 friends and stayed early September for a week. Overall our impressions were excellent.
The apartment is quite big, more than enough space for us. It is very quiet and quite well furnished. We had everything we needed to make our stay as relaxing as possible. The bathrooms were new and well kept, which for me is very important. There was a washing machine, dryer and a dish washer, which were quite useful. Also the central air-conditioning was not that needed during our stay, but I am sure will be perfect for people visiting in the warmer months.
The only two things that I can consider as negatives are the fact that we were provided an USB stick for the internet and the connection was quite slow and the TV was quite close to unwatchable (it made some really weird knocking sound every know and then that really bothered me). Very small details, considering we actually never turned the TV on and the internet connection is good enough for a vacation i.e. sending e-mails and reading some stuff. That and the lack of a stereo system were the only things, that were not quite accurate in the description.
As far as the location, I found it quite perfect. There were hardly any people on the beach, which I really enjoyed, it made for some relaxing time under the sun. There are two shops near the apartment, which made shopping quite easy, there was a really good restaurant we went to for our last night and the city is quite nice, although nothing spectacular. The train to Barcelona is very regular and the journey takes around 30 minutes and is 7,60 € the round trip, which adds up if you are travelling often, I would recommend renting a car as it will be similar money.
As for the owner, she was quite nice, everything was handled really well and she helped as much as possible. Would gladly recommend the property to anyone wanting to visit Barcelona and relax at the same time.