Juan's place is in a great location in Chuecca right in the heart of it. With that of course you get some street noise but for the most part it is manageable. The apartment is stylish and is very "Madrid".
There were some issues with the check-out due to communication (no prior messaging on timing requirements, only on the spot) and some cleanliness issues with the kitchen (fridge had a bad smell).
Otherwise the place is nice.