We spent 10 days in Oscar's wonderful apartment this February and I can't say enough about how perfect the location is. You are a 30 minute walk, maximum to almost anywhere you would want to go. Go towards the sea and you hit El Born, the Gothic area, El Raval etc, Boqueria Market, with Eixample and Gracia in the other direction. In the entire stay, we took a taxi three times and just walked everywhere.
There are a couple of great spots for morning coffee and sandwiches on the block, a grocery store right across the street and the subway, if you need it, is also just down the road.
The beds are comfy, nice bedding, the kitchen isn't as well equipped as other airbnb's (if you really like to cook) we have stayed at but it has all the essentials. The shower has great water pressure and plenty of hot water and although I had read about issues with subway noise and wifi, we found that these were not a problem at all.
My main concern was that the place might be chilly since it was February and it is an old style Spanish flat with really high ceilings but the heaters worked really well and we found it comfortable, even on the coldest nights.
All in all, I highly recommend this apartment.
*One note - the second bedroom is situated in such a way that you have to go through it to get to the bathroom so keep that in mind - we were travelling with our teen aged son so it wasn't an issue for us at all. Also, the second bedroom doesn't have a closet or shelves etc so they have to keep their clothing in the large closets located in the main bedroom - again, not a problem for us, but keep that in mind.
It looks just like it does in the photos - clean, charming and with a touch of traditional, old fashion charm, soaring ceilings and doorways, a lift and a nice, quite building.