There's more info below. I'll make a bigger post soon, but here's some info on your questions.

In this place we got evicted because we were noobs, they claimed to have a building permit and the owner started stripping the floor below us, where they almost came through our floor. We decided to leave before we'd be involved in an eviction court case.

Homeowners can leave places empty because e.g. they want to kick out all the renters (social contracts) so they can renovate the place and sell it for big bucks. In our case the building was also part of a maffia network that used real estate transactions to laundry money. The headquarters kept records on homeowners and ownership and historical transactions are publicly available, so we could figure out what was going at our (potential) squat.

The kitchen, toiler and shower were pretty basic. Just some wooden pallets with nails in them. I am no carpenter so it was not that great. The toilet's walls were curtains and we had to flush it with a bucket of water.