The apartment was great. Very clean, big enough for 6 people and in a brilliant location. It was only a 3 minute walk from the Sagrada Familia, and had supermarkets and Metro stations close by to get groceries and travel around the city easily.
Kitchen was well stocked with pans, pots, crockery, dishes etc. for cooking in. Towels and sheets were provided.
The hosts were great with communication, always replying quickly to questions, check in and out was easy and they offered to arrange transfer from the airport. A friend of theirs let us into the apartment and she was very friendly and gave us all the information we needed for our stay, and we had good recommendations for restaurants and cafes in the area.

Only 2 very small things to bare in mind -
1. The hot water ran out quickly for showers in the morning. We had to limit time in the shower for all 6 of us to get hot water, but once we knew this after the first day it wasn't a huge issue. Staggering showers in the morning and evening is probably the best option.
2. The street outside was very busy and noisy if opening windows at night, but the temperature in the apartment was good (heating and air con available) and the double glazing meant no noise could be heard when windows were shut, so again, not a massive issue.
Overall a great place to stay and lovely hosts! Would definitely recommend.