Carmen's place is in a much older building with older interiors, but lots of character - just like the city itself :-) the bed is not a bed but a mattress on the ground big enough for two (perfect for my sister and I). Nonetheless, it was comfortable enough. Note also that there are no elevators so we had to carry our heavy luggages up the stairs, but this seems to be the norm for Barcelona.
The real plus for us was that this place is in an IDEAL location - right by the main shopping street, Las Ramblas. Yet, it is one street over so it is not super loud at night like we expected. Everything was within walking distance! We really enjoyed this!
Carmen is a very welcoming and communicative host.
We would recommend this place for your stay in Barcelona!