Me and my friend stayed for 6 days and had a lovely time in Barcelona. The apartment was super central if you are looking to have a walking distance to attractions. The beach was more of a 30 min walk but it’s a lovely walk with restaurants and stores on the way.
The apartment itself had a very esthetic feel to it and the hosts made the stay welcoming as they were also helpful with questions and tips. I traveled with a friend, but if you travel on your own, I suggest you stay here because it had a safe feel to it. The rooms were very simple and clean.
The only FYI I would add (which a lot of people have already noted) is that there is no elevator. Please be prepared that they do live on the 4th floor and therefore you will have to carry your luggage up. Also it is a shared bathroom but we had no problem with this at all. Another thing is that we thought we had the apartment to ourselves which we later understood that you share the apartment with the hosts and possibly another renter. However this turned out to make our stay very pleasant.
I will definitely go back there as I am planning on traveling several times to Barcelona. The apartment made the trip even better!