Lovely place! We enjoyed relaxing in the enclosed courtyard when not out and about seeing Barcelona.
Don't be put off by the sofa bed, it was really comfortable. We would recommend using the airer (kept in the laundry around the side) to hang your towels on, as we found they didn't dry so well in the bathroom.
Isabel was a fantastic host, and was great with communication, contacting us every few days to make sure we were doing well. The house was private and at the same time amidst the hubub of the city.
There are lots of local cafes/bakeries nearby where you can get some pre-made sandwiches/baguettes to take out with you for lunch.