Montserrat is a wonderful host. The house is very clean! The appartment is situated near the Metro and not too far from Sagrada. ( 15 minutes walk)
I could use the airco: wonderful.
In the kitchen is hanging a good map op Barcelona and Montserrat can tell you a lot about the city.
The appartment has also a terras on the attic with a vieu over Barcelona.
I would recommend to stay at Montserrat.