I agree with the other reviewers. The location is perfect, less than 2 blocks to Casa Batllo, great bakery, Crusto, around the corner, convenient to Metro, Placa Catalunya, and Ciutat Vella.
One thing no one has mentioned is how quiet the flat is. Although it is on a very busy street you would never know it. The flat faces the back of the building; we never heard any traffic noise.
I also agree with comments about Jepis. He was very helpful and kind. Our flight arrived quite early on a Sunday. Although there was a previous tenant who had just left, he met us at the flat, let us leave our luggage, and made suggestions for breakfast while he cleaned the flat. He had great suggestions about restaurants and shopping.
Finally, some reviewers mentioned the lack of air conditioning in the small bedroom. We were there in August and were very comfortable. There is a small fan that moves cool air into the room from the hall. I wouldn't hesitate to stay here again, even in the hottest weather.