have a look where people from a german bikeforum overwinter their bikes. they have dry and warm places…
mine is out in the garage - the flat is only for me.
Mmmmmmmmmmmmm … they look cozy & warm!! 
Marco, they’re not so crazy, if I could keep my bikes indoors, I would! There’s no way unfortunately. If they were in the house, I would forever be cleaning, and loving them, hehehe.
I do worry about my bikes outside over the winter, despite them being locked and covered (multiple times). I’m researching a tent-like enclosure for them at the moment, so I can keep them drier, and warmer.
Thats where I’d keep mine…couldn’t get it up the stairs though
really? you mates would do that? in your flat? okay i understand you jay bout the bikes outside on the street or the yard (have seen your k5 locked with a chain on a pic in your last threat), but i dont think i wanted a bike in my flat. mine is in the garage between the bandit of one neighbour and the beetle convertible of my landlord so she is not lonely. 
the neighbour in on the other side of the street has a real vehicle fleet. 2 ducs, 1 husquarna and a porsche 911. during the wintertime he is drinvin his audi s4 estate. a lucky man i think…
My bike lives in my house! i quite like it like a sculpture or something. Its safe, dry, and smells nice! I’ll get a pic up when i get it back. LB stickers and carbon to show off too.