Electronic Frontier Finland (6 N 45) has a very olohuone-like feeling, our stuff is from recycling centre :-)
Some entry tickets might be available too (or if you have the Suomalainen kirjakauppa customer card thingie, you should get a couple of free tickets with that from them).
Doing it all the time would take quite a bit of energy, not to mention time & car to move the stuff around. Maybe start with organising a yearly Olohuone thing? Does someone have a reference handy to the original thing? The railway station was a really nice location, I wonder if it would be possible to get some corner in the new Kamppi terminal at some point? Maybe get kierrätyskeskus involved – could perhaps get furniture & help with moving stuff from there?