The location of this apartment is fantastic! It's on a quiet street just up from the Passeig de Gràcia, so Barcelona must-see locations like Gaudi's Casa Batlló and Casa Mila are within walking distance. Plus the residential neighborhood of Vila de Gràcia has everything you will need - grocery stores, a local market, local shops and more, including Gaudi's Casa Vicens. The other major sites are easily reached by metro, bus or taxi (there's a taxi stand around the corner.)
The apartment itself is up 4 flights of stairs. The space is large and was perfect for the 4 members of my family. It's comfortable with lots of places to sit and set up a laptop or ipad. Beds were very comfortable and the owners are generous with towels. The kitchen was well equipped but the dishwasher and microwave are a little quirky. There are a number of markets nearby so we were happy to cook breakfast and light meals in the apartment.
Overall this was a very comfortable apartment. Plus the owners were very helpful and very responsive.