What sort of sound-absorbing measures exist for a Steinway in apartment/rented houses?
You can use special cups for the casters which are filled with rubber to reduce the noise on the floor. Furthermore, carpets, curtains and furniture help to reduce the sound, whereas smooth surfaces like wooden floors, stone floors, large windows and high walls amplify the sound. It is possible to install a so-called “moderator” (a felt strip in front of the strings) which reduces the sound significantly. Another alternative would be the installation of a silent sound system which allows you to play without making any sound. The player can hear the tones electronically via headphones. Please ask you local dealer about these systems.