Our stay at Natalia's place was great. The apartment is true to photos, very clean, updated, amenities such as tv, wifi, washer/dryer are pretty new, it us spacious enough for 4-5 people. There is a walk up the stairs and there is no elevator in the building but it is no big deal. Natalia is a great host, she met us as soon as we arrived and explained everything to us and was available through texting very quickly for any questions. The neighborhood is very safe, quiet, there are restaurants and markets nearby. The metro station is walking distance and in a few minutes you are in the center of the noisier parts of Barcelona.
The one minor issue is that the building's pipes are old so it takes a while for the shower water to drain out and the shower is a bit shallow so you have to be careful it does not spill over. Other than that our stay was lovely and I would recommend Natalia's place for a couple or family.