Absolutely fantastic, if you are reading this to decide whether to book, then you now need to book! Carlos' apartment was clean, contemporary, relaxing but with all amenities should you wish to use them (cooking facilities etc). The added bonus of use of the swimming pool was brilliant. Lovely soft clean towels, pool towels too and fresh crisp sheets on the bed; I'm quite particular about such things but wasn't disappointed.
Perfect location for metro (underground) we used Charmartin from the airport but walked one stop down to Plaza De Castilla when going towards the centre.
2 fantastic restaurants we'd recommend Sal Negro (10 mins walk from apartment; beautiful outdoor setting, fabulous gastro style menu) and Lupertz (fusion style tapas) in the busy trendy area of Malasana (nearest metro Bilbao).
We went to Toledo one day on the overground, only 30/40 minutes, very pretty, very steep city, full of history, marzipan and knife shops!!!!!!!
Mercadona right across the street for supplies; plenty local eateries (a dozen or so) within 5/10 mins walking distance.
Madrid is fantastic, plenty places to explore, 4 days was not enough.
Thanks Carlos for making it so accessible and chilled