This is a very cost effective place in an extremely well connected, convenient part of Barcelona. It is very easy to get to by public transit, particularly from the airport (note: use bus line 46- it is cheaper and comes closer to the apartment. Buy tickets before boarding). It is near to the start of the trains to Montserrat too, as well as subway lines and buses all over the city. Also there is an excellent bakery (Rovira) right across the street on the corner! And a really tasty and friendly Chinese restaurant nearby on Gran Via (Noodles and Rices).
There are also some drawbacks. A lot of noise comes in from the stair and impacts one of the single rooms and the double room (if the room door is open). There was not any street parking to be found- it is all two hour, except for residents, but there were not usually empty spaces anyway. There is expensive paid garage parking over by the Magic Fountain- make sure to book and prepay to get it for a third of the price. Also there are several easily fixable items that could use some attention from the host, which we have let them know about.