Christina's place is wonderful! It's an a vibrant and hip part of el Poble Nou. We rented bikes, and it's just 10-15 min cycling to many things in the center. The beach is nearby and great! Many cool places (such as Balius Bar, Minyam tapas bar and Madame George cocktail bar) just around the corner.
We loved her dog and cat, they are quite old but very lovable and funny. Maca, the dog, loves to cuddle but is very relaxed - Marietta the cat likes to eat a lot :) I found out during my stay that I was a bit allergic for the cat and Christina made sure everything was clean and nice.
Christina helped a lot with things, also when I needed to see a doctor (there a great hospital faculity walking distance, just in case)
Two minor things were that we had some issues getting the shower in the right position and temperature (but perhaps this was only temporary) and that the sleeping room is located at the front of the house so when it's warm and you sleep with the window open there will be noise from the street - to be considered for light sleepers. But Christina does provide a fan and airco system as well.
Everything combined it was a wonderful experience and we would definitely recommend it!