Easy self-check in through mobile app. Supermarket Mercadona just in front of the apartment, Metro station 5 mins walk, 25 min walk to Passeig de Gracia. A lot of small cafes/bars nearby. Underground parking was a great bonus, though indeed narrow.
Comfy bed mattresses. Extra towels and linens provided. Clean bathroom, although toiletries not sufficient and not according to the pictures on airbnb. Basic tableware and utilities in the kitchen.
Although our stay was ok, the main discomfort was the fact that the apartment was not exactly as presented in the photos (i.e. no Nuxe toiletries; scratched walls and floor; old, scratched furniture; different furniture (coffee table) in the living room. The bed lamps were broken in both of the bedrooms, and we found an additional broken lamp hidden under the curtain in the living room. As SweeInn retains a deposit, I would suggest taking pictures of the state of the apartment when you check in.
We also had an issue with the absence of water in our apartment on the first night of our stay, but it was a problem for the whole block of flats. Also we had a leaking pipe in the kitchen sink, that SweetInn solved by sending a handy man the same day.