STR is a pretty neat airport one of these nice German regional airports that have so much less hazzle then e.g. Frankfurt has. STR still does offer some attractive connections and make it a real alternative for intra-European flights. But beware: Although they promise a minimum connecting time of 30 minutes this is absolutely not manageable. The problem is that in some instances you can't transfer airside but have to land yourself. This is definately valid for those flights arriving from non-Schengen airports. You have to go through immigration control and customs go out to the public area go one level up and proceed through the normal security control. Depending on the time of day this can be VERY lengthy. And from here it still might be a pretty long way to your departure gate. In the end this is even more hazzle then transferring in Frankfurt. Plus a missed connecting flight.