perhaps it is because I live in Montreal, but I wouldnt leave a bike outdoors overnight in an urban setting, its just asking for trouble. Of course when I camp bike touring the bike is locked up overnight near the tent, but in an urban setting, nope.
Most places in Belgium and the Netherlands were good about having a secured garden or interior area our bikes were allowed, but the hotel we stayed at in Amsterdam the last couple nights refused them in any sort of private area whatsoever. They pointed at the public bike racks outside and told us to lock them up there, and there really was no sneaking them into our fifth floor room. It isn't the easiest doing research about bike parking when you are credit card touring.