Our stay in Madrid was great!! Helios was always responsive, willing to help us and accommodate us in any way he could.
The apartment was neat and clean, as well as the building. The bathroom and kitchen are newly renovated, kitchen has everything you may need during your stay, big bedroom and a nice size closet, beds are comfortable. Location couldn't be better, steps from Plaza Santa Ana, walking distance from Plaza Mayor and Plaza del Sol, 2-3 blocks from the metro station. There is a little market literally across the street.
Safety was never an issue when coming back to the apartment after midnight with our two kids.
We could definitely stay there again and will recommend the apartment to anyone who would like to go to Madrid.