The apartment was exactly as displayed and expected. Basic and modern and in a clean condition as well as a comfortable bed and excellent shower. Being within 50 metres of Atocha makes it excellently located for a brief stopover.
Communication with Carmen was good. When arriving don't be disturbed by the sign Hostel. There is a small Hostel in the building and was very quiet when we stayed. Carmen's apartment is in a tightly bunched group with shared entrance and you may occasionally hear muffled sounds but not at a level to disturb you. Nothing more than expected in close apartment living.