We loved the feel of Sergi's place and he was an excellent host. We had a problem with the hot water and he very quickly arranged for it to be fixed and also cut short a trip of his to do so. Problems can arise in any property and it is how they are handled that makes the difference. I think you can totally rely on Sergi to sort anything out.
This apartment is very convenient for the metro but is also within walking distance of much of what a tourist wants to see.
We would definitely stay here again if returning to Barcelona.