Quim is a very friendly host who responds very fast and has an excellent high tech check-in process. The apartment is close to Placa Espanya and thus fairly good to reach. For someone who wants to visit the city center mostly, this place is somewhat out of the way but still doable.
The apartment is big enough for four people and has everything you need (shower, washing machine, refrigerator, cooking equipment, balcony). There is also an elevator, so the apartment is nice.
The only issues are with the state of the apartment in some ways. The shower could be cleaner, the doors have issues (bathroom door lock is broken, doors are stuck, kitchen cabinet broken) and the sleeping sofa is also broken. If there is one good cleaning round and some broken things are fixed, the apartment is quite a good stay. Do keep in mind that if you are tall (>1.80-1.90) the beds will be way too small.