Apartment is in great location La Latina - the "real Madrid". Many bars with local people around, but the street around apartment is very quiet. You can walk to all highlights, no need to use public transport.
Apartment itself is very small, but nice, modern, clean, you can find there everything you would need. We didn't meet owner personally, but we easily picked up keys in restaurant nearby.
If I would came to Madrid again, I would strongly think about this apartment again - I really liked the location.