Advantage:
* Perfect location if you like to walk around in the city, you can basically walk to gardens in Montjuic, or to the beach, or to Gotic neighbourhood. Nice cafes, restaurants are just 2 minutes walking distance from the apartment.
* The host is super chill, we had a late flight from Germany but did not have a problem reaching out to the host. He was caring and giving attention to explain things at home. They wrote their suggestions, left maps and travel books of Barcelona.
* The kitchen was perfectly equipped, in terms of tools you might need. +big refrigerator. If you're planning to stay long or cook at home, it is a big advantage. (even though we prefer eating out)
Disadvantage:
*I would never think that I got cold in Barcelona but if you are visiting at the end of January that's something to be careful of. Heating depends on the AC and the host told us to keep it around 24 C', sometimes it was not enough to warm the apartment. Bring thicker clothes if you're used to live in a house with gas heating system.
* The bedding linens looked clean, however when we had to take the blanket out of the linen to put a second one (because it was cold), we realized that the blanket was heavily stained. Just like washing the linens, I would suggest the hosts to take the blankets to cleaning every now and then.
All in all: Great if you don't care anything but location. Not so great if you are a person of details. With a little touch to cleaning and maintenance in the apartment, it might be a better experience.