We were a family of five people on vacation in Barcelona. We chose Mary's flat as we needed a quite and clean place away from the city centre, but close to metro stations and supermarkets to buy food for self-catering. Overall, Mary's flat met our desires. Some points to note. CHECK-IN 4/5: Mary told me in advance that she won't be able to meet us as she was not in Barcelona. Instead, Mary asked her friend to meet us and manage the check-in on her behalf. But the friend did not speak English, only Spanish and Chinese, I guess. I could not understand the friend of Mary, as I speak English and Russian. However, I found print-outs with instructions hanging on the walls and on the fridge quite useful. COMMUNICATION 5/5: Mary was super friendly and polite. She responded almost immediately to my questions. Her answers were to the point. FLAT 4/5: the space was enough for five people. Wi-fi was excellent. Air conditioning was excellent. Some cooking essentials were a big plus, including oils, coffee, tea and spices. Disliked small pillows in the bedrooms, but it was not a big problem. CLEANLINESS 4/5: the flat was clean and bright overall, but some dust and hairs were under the beds. LOCATION 4/5: from the 'Maragall' metro station, it took 10-15 min by feet to reach the flat which was bit longer than I expected (even longer if you have heavy luggage to climb up the hill). Better to use buses, but make sure to buy T-10 in advance at the metro stations. For location, there was a very nice supermarket 'Condis' next to the flat (but it closes at 8:30pm on workdays and is closed for weekends). SILENCE 3/5: neighbours... they woke up early and turned the music on loudly every day. Perhaps, better isolation on the windows would help. Also, there were loud sounds of water pumps in the flat, when someone used a bathroom. OVERALL EXPERIENCE 4/5: we enjoyed our stay in Mary's flat, as it was a good fit to our expectations.
FINAL TIPS: I used Placa Catalana (not Placa Catalunya!) as a landmark to find the flat, as it was easier to find it in Google Maps. If your travel to Barcelona for a week with a family, try to buy T-70/30 ticket at the metro station, so you can save up to 60% of the single ticket price.