Excellent location!!! Better you could not find!
From here you can reach anything in Barcelona really easily both on foot and with the metro! Just a warning if you find it annoying, there is no elevator, and you need to be able to go 4 flight of stairs to get to the apartment. Also it can be very noisy especially in the weekend as it is on placa reial, but the windows are quite good so once they are closed you hardly here anything. It is a great vibrant atmosphere down there and it makes it really special!.