Svitlana's place is perfect. It's literally right across the Sagrada Familia, right next to the metro, lots of cafes and a 24 hour supermarket nearby. The apartment itself is cozy and spacious and none of the street noise carries through. She's very nice and accommodates you. I would highly recommend this place.
Just a warning: the bedrooms have windows but no natural sunlight so it always feels like it's 3am. Set an alarm cause the first morning i was really confused.