Living in a room without inventory, then you may drill into the wall. Do you have a furnished room? Then drilling is not allowed.

Take care when drilling
You must not drill into walls where wall sockets, switches, CO2 meters and the thermostat are fitted; from floor to ceiling, over a strip of about 25 cm either side of this switchgear.

Nor is it allowed to drill, screw or nail into the marmoleum (floor covering) and cement screeds of the various rooms. This is because these contain the pipes of the central and/or underfloor heating and electricity, so there is a high risk of leakage or malfunctions.