We were a family of 4 with two little kids and stayed at this place for a week in Spring 2019.
Overall experience was great. Most tourist attractions are within 15 min walk (with strollers and two toddlers) and streets were filled with vibrant and positive energy.
I've seen a lot of previous comments about noise but for us it was not a big issue. Our sleep was not affected since the bedroom is located away from the main street.
One thing to note is that Ferran street is inaccessible during certain hours. We had to walk about 150 meters (160 yards) from Plaça de Sant Jaume to the apartment. Fortunately our hosts graciously helped us move our bags during check-in & out. They even let us check-in early and leave bags for several hours after check-out to accommodate our next schedule.