My wife and I stayed at Aga's place for a winter break in Barcelona.
We had a very pleasant and comfortable stay.
The place is well suited to exploring this wonderful city; La Rambla is only a short walking distance and an underground station is just a stones throw away. Amenities such as fruit and veg shops, bakeries etc are also around the corner and really convenient if like us any guests prefer to cook a few meals.
Aga was also kind enough to arrange our taxi transfers to and from the airport which made things very convenient for us.
The description of the property makes it clear that there is no lift; we had no problems with that however I imagine could be a consideration for some people.
Overall, I would have no hesitation in recommending this place for people considering a homely and comfortable option during their trip to Barcelona.