I stayed at Marta + Paul's place for a week and it was perfect! It's located in a super convenient part of town where we could easily walk to all of the tourist attractions, restaurants, and shopping. There's also a metro stop ~5 minutes away if you need to go somewhere farther, but we never used it because we could get everywhere by foot! The apartment itself is spacious, clean, and stocked with everything you might need (with the exception of soap/shampoo/conditioner in the shower, but that was not a big deal because there's a convenience store right across the street). I had to work during the time I was visiting and the WiFi was strong - I was able to Zoom with colleagues back in the states with no issues. Check-in was also very smooth. If I'm ever back in Barcelona, I will definitely stay here again!