It was a pleasant stay for me, my wife and our 5-yrs daughter.
The apartment was clean and tidy. It was equipped with all the stuff we needed (glasses, pots, coffee maker, wifi, tv, air conditioning, etc.). The neighbourhood was perfect - full of nice architecture and totally green with plenty of trees. The metro station and tourist areas (i.e. Las Ramblas, Gothic Quarter) are in a walking distance.
Mik was a superb host! He welcomed us warmly, helped us with the bags (the elevator is quite small and it was a bit tricky to use it with all the bags) and showed the whole apartment. He was always there when we needed him :-) responding quickly to our messages. Restaurants and bars he suggested proved to be good choices too.
In summary: Highly recommended! :-)