Becca's place is in an excellent location, you cross the street and you're in the Sagrada Familia! Couldn't have it better, it is a 2 min walk from the metro station so you can go anywhere in the city very easily. There are many good places to go and grab a bite around the area.
We didn't realize the check-in couldn't be done until 8:00pm, so have in mind that you'll have to find a place to store your luggage in case you arrive earlier. We would have appreciated that the rules for the apartment were available at the add description, as they did take us by surprise. My friend likes to shower before going to bed and in the morning just to start the day fresh, but we were not allowed to shower more than once per day. A simple rule but would have been nice to know things like this in advance.
Overall, it's a great place to stay if you plan to be most of the time out and about getting to know the beautiful city of Barcelona :)