It looks like I'm going to solve my-lack-of-a-bicycle-for-a-few-months-problem by going n+1 (so I'll have a second bike when guests come and visit me in England).
I'm looking at super inexpensive bikes with flip-flop hubs for around 300 USD bought here in Copenhagen, so I can get the fit worked out and ride it around before buying it.
They seem to be spec'd very similar to these:
with different stickers.
What things should I be looking out for besides fit and finish? I've never had a SS/FG bike before, so do I need to look for a particular type of dropouts, etc...