We had a great 2 nights in Carlos's place which is very centrally located and really accessible to all main attractions of Madrid. The flat itself is subtly furnished with all what is necessary for a short stay and also some nice touches such as crisps and wine offered on arrival! The communication with Carlos was super easy and he left some good advices for places to see around. Only small issue was the noise outside the building at night ( which comes with being in a lively surrounding) but nothing from Carlos' fault.
I can only warmly recommend this place