Great location, very central (two subway/metro stations close by, Line 1 + buses) a 24h supermarket (Carrefour) a 24h Fast food place (McDonald's) so this is an excellent home base for your Madrid adventures.
Climalit makes the apartment nice and cozy and having a washing machine + drying rack can save you valuable packing weight/space.
All in all good experience, just take note of the late check-in fee (this is clearly stated in the ad, just make sure you are prepared for this) as it does take a bit to get from the airport to this location if using public transport. If you want to get there fast and for a decent fare, use Cabify. (check for discount codes at Barajas!)