We had a lovely stay. We didn't meet Eduard (though he was easy to contact by text and phone), we were let into the apartment by a friendly lady who showed us where to find everything.
The apartment is just a bit out of the city centre, and was a little tricky to find, but once we worked out our way to get to and from the underground we were fine.
The apartment is cosy and comfortable, and had everything we needed, including spare towels and extra pillows! The kitchen is small but great for cooking simple meals for four people. There are also some nice restaurants nearby. It was useful to have two sets of keys too.
Barcelona itself is amazing and I would recommend it to anyone. Don't leave before seeing the Sagrada Familia, and having churros and hot chocolate!!