I run a collaborative workspace with a group of friends since 2013. The space functions both as an office as well as a common living room. We've had a varying group of people from architects, graphic designers, web designers and service designers working separately and together. There are also weekly movie nights and occasional underground parties.
The name 7,5 is a reference to the movie Being John Malkovich, where John Cusacks character starts working in an office built between the seventh and eigth floors of the building. Our first space had very low ceilings.