Adequate, but not the best experience. Rosa was very nice and helpful prior to the visit and when we met in person, but the overall experience was less than to be desired. On the positive side, the location very near the Liceu metro and Boqueria market was great. Additionally, the apartment itself had 2 x bathrooms with showers, good WIFI, and enough room for 4 (6 may be tight in the common area). On the negative side, the biggest thing that bothered us was the double standard on the noise, particularly within the apartment building. It is made very clear that visitors can be kicked out without reimbursement if the neighbors within the building complained of noise, but that did not seem to apply to one particularly neighbor who proceeded to make a ton of noise partying until 4am within the apartment building and inner patio area right outside where my children were sleeping. We had to call Rosa to call the police for us at 2am... who never ended up coming. We fully expected street noise, given that we were in the heart of Barcelona, but the double standard on the noise within the building - no thanks. Additionally, the initial link up at the apartment could have been better... waited 30 minutes on the street for Carla to show up to let us in, after we had already set the time to meet, texted and called upon landing, and texted and called Rosa after not hearing from Carla - and no apology given... not a great way to end a day of traveling.
Good location, but would probably find another place to stay next time in Barcelona.