The place is really nice and it's hard to imagine a better option for people who travel to Barcelona for the first time (like me).
It is located in the very centre of Barcelona, almost all the main sights were about 10-20 mins walking from home. Beach was about 20-30 mins walking, but if you've got a ticket, there is a bus that can get you there for much less time.
The flat itself was always clean and nice decorated and kitchen had everything to cook. I liked the room we lived in, it's quite cozy with a nice balcony, not large, but ideal for 1-2 people. And I especially loved the cat, which was greeting us every time we got back home.