This place is perfect!! First of all, Elizabeth is an amazing host! When I arrived, she walked me all around the neighborhood to show me the subway, cafes, etc. it was above and beyond and helped me immensely. She was so communicative and helpful throughout. You definitely need to check out her gorgeous clothing shop while in town - it’s very close to Sagrada Familia.
As far as the apartment goes, the location can’t be beat. It’s in a regular neighborhood, not touristy, but everything you could need is within a few minutes walk. It’s safe, even at night as a solo female traveler. The place is quite private, and has everything you need. Can’t recommend enough!