Just returned from Amsterdam and stayed at the Mosaic. Calling this a hotel pushes the bounds of reality. The only thing place is suitable for is literally if you are a student or on a drunken stag night. If you expect anything better you'll be disappointed. As for security, ring the door bell on the ground floor and the door entrance to the block is opened then its straight up to the entrance door of the room. As you can see from the pic its extremely cramped for 3 people.
No way would we go back there.
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