A huge thank you to Marta!
Everything was fantastic- the flat was as described, spacious and very clean. The area is nice and quiet. There is a metro very near, so it's easy to get around and also there are several supermarkets, so you can get everything you might need.
A seperate thank you to Marta herself, she is a very nice person, very easy to talk to, she responds very fast to any queries and makes sure that everything is perfectly clean and comfortable.
I would defintely recommend both her as a host and her flat, next time we visit Barcelona we are planning to contact her again!