It was a good experience at Gunnar's appartment. We are a family of 7 people and we all had our own space during 4 nights, each couple having his room with a double bed. Unfortunately the doors are a little bit noisy.
The prime location of the appartment, situated on Rambla de Catalunya, 7min away from the center, is the strength of this product. On another hand, the terrasse is also nice and there is a nespresso machine in the kitchen (just need to pass by the Nespresso boutique in Passeig de Gracia ;))
There is an elevator that takes you to the 3rd floor but then you have to continue climbing to the 4th via the stairs which would be very bothering in case there is an older person or someone with back problems to take the luggages upstairs. This is a detail that should be mentionned upon reservation.
It is a good product but overpriced compared to the market.