Rosa is a wonderful host and her apartment was perfect for us. It was clean and comfortable, and had all the comforts of home. It is centrally located and within a 20-30 minute walk to La Ramblas and Placa Catalunya. It is within a 5 minute walk of the Poble Sec metro which is the #3 green line and goes to most tourist sites. Bus routes are also outside the front door. There are many reasonable restaurants and a grocery store across the street.
Rosa met us when we arrived at the apartment with an English translator. I asked Rosa in advance about train transport to the Dali museum in Figueres and she had printed the train schedules and prices for us.
I highly recommend Rosa's apartment and will book it again the next time we are in Barcelona. Our trip was terrific because everything exceeded our expectations.
Though we did the Dali tour on our own for maximum flexibility, I recommend taking the guided tour which offers the high speed AVE train since it is almost the same price as doing on your own and they provide a guide.