I used to live 3 km from their datacenters here: http://www.datacenterpark.de/ Basically in the former East Germany. They are doing things the right way. I am not hosting with them at the moment, but I have been for a couple of years without issues.

You must also know that the EU paid some good money to get the datacenters there as part of economical development initiatives. Hetzner is operating since 1997.