Michal is a very nice man, the check in was flexible and it made it very easy for us.
The Airbnb is a single room in a corridor with one another bedroom which he rents too, and he lives on the other side of the apartment. you share a bathroom and a kitchen with them.
Me and my friend liked the place, if you need privacy (for couples) you might want a more private place.
There are 80 stairs to the apartment so it won't fit you if you have bad knees, but it was just fine for us.
The apartment is very close to La Rambla and placa Catalunya which was very convenient. There are many restaurants and pubs around which is awesome. The Airbnb was definitely worth its price.
I recommend staying at Michals place.