My family and I stayed at Montse's place for two weeks while I was finishing a project in Barcelona. The apartment is amazing, freshly renovated and very cozy. The location is great, close to the subway and surrounded by stores and restaurants; it's just around the corner from Sagrada Familia but you still feel like a "local". The whole family had a great time and my daughter loved the multiple playground options, all just a stone throw away. The road is a little loud but actually still pretty quiet for Barcelona' standards. Tip for families with young kids: there's no elevator so bring light strollers. We would definitely stay in this apartment again!
The host was very nice, helpful and waited for us at check-in even if it was pretty late at night.