My wife, mother and my one year old son stayed 4 nights at Rosa's lovely apartment. From the start the communication was great, Rosa was waiting for us and showed us around her home. The place is very clean, quiet, well equipped and in a superb location. Only 5 minutes to the Metro, many bars and restaurants, grocery stores, and very close to the heart on Barcelona.
For children it was perfect, very quiet and has a high chair and baby crib. The windows have shutters if your baby needs a daytime siesta.
In short, I can't recommend Rosa's home enough.