Perfect location for a couple wanting the center of madrid on their doorstep. We managed to walk everywhere we wanted to go without ever getting the metro because the flat is so perfectly situated.
Incredibly modern amenities, the flat has an almost futuristic feel, everything in good working order.
Bring some earplugs if noise bothers you as it is on a very lively street (personally we loved this, hanging out on the balcony with a rum at 2am watching the locals pass by was a treat.)
David was always quick to communicate if we had any questions replying in a matter of seconds.