Sebastián is a very friendly and sincere host. He provided me with everything I needed, was clear in communication, gave directions and tips for moving and eating around. He even refunded part of the day fee when construction workers unexpectedly started to drill and yell early in the morning. (These works were not a nuisance in any other way and did not affect any other aspect of my stay.)
His place is tidy and has everything I needed for a short stay with lots of outside Barcelona time. The room gets a little warm (in summertime), Sebastián warned me about it beforehand. As I was out most of the day this didn’t bother me. At night using the fan and opening the door to the terrace were effective enough for cooling down.
The neighbourhood is great, with lots of nice coffee spots and lunch & dinner places. Lively and with a soul. Public transportation (metro) is very near and connects to the rest of the city quickly and easily.