Esther is very helpful and welcoming, as others have stated. She was flexible in terms of time of arrival, which was useful.
As she showed me around the apartment Esther noted things which were missing, such as a large towel for the shower, or bottled water and she made sure that they were there later for me.
It is a very quaint and pleasant apartment and great for younger folk looking for something different from standard hotel rooms. I say "younger" because people over a certain age might struggle with the stairs - ca. 120 steps is a lot if you are at the end of a long day or carrying heavy luggage. Also, if you are built for comfort rather than speed you will find the toilet a very tight fit. This could be made clearer in the description.
I was in Barcelona for business so didn't spend much time in the apartment which was a shame as the terrace is a very nice place to be in the evening. There was a fantastic thunder storm on the second night I was there and the roof top bedroom was a great place to experience it!
The surrounding area is great - bustling, lively, close to the cathedral and metro stations.