I wasn't sure where to put this... I came across a photo-article about Airstream hotels. I knew about 2 of them (and have seen references to at least one of those on these forums, the new Shooting Star Drive In.)
The one in Berlin doesn't seem to actually have any airstreams, but they have some European caravans to stay in. The first image clearly has a few extra windows, it seems to be used as some sort of bar.
The Shooting Star apparently has a Squarestream as one of their guest trailers, shown in pictures 28 and 29.
The Coolest Airstream Hotels Around the World