I only can recommend Mònica's apartment! The location is great very close to the Carrer de Blai with lots of opportunities to sit and relax and enjoy some Pinchos or drinks. It is a bit apart from the touristy destinations of El Raval and Barri Gotik but close enough that you can reach them by a short walk of 15 to 30 minutes, depending where you want to go.
And the beds are great to rest and get new energy for the next day!