The museum in Bolzano, Italy where Ötzi is held is well worth a visit and the items found with the body mentioned in this article are also on display
with theories about their use and significance: http://www.iceman.it/
Navigating to the directory from the 'Files' tab and clicking the 'i' icon to the right of each filename available for download displays the 'View details' panel with the SHA1 hash of that file. Is that not enough?
You need to be willing and able to learn German in addition to simply working in Berlin. Depending on your ability to pick up new languages, this can be quite a lot of extra work in the evening and/or weekends (it was for me).
Not everyone can, or is willing to (e.g. in banks) speak English, or you may sometimes find yourself on the wrong railway platform, or having a long wait in the wrong queue when you cannot understand German.
The big German cities I know well: Berlin, Hamburg and Munich are all very nice places to live and work.
There is some cumulative error (maybe one second per hour) after sleeping in increments of 8 seconds (the longest interval possible with the watchdog timer) because of the time lost starting up and shutting down, so this approach is not 100% accurate.
Running direct from 3xAA batteries (=4.5V) means that you can avoid a voltage regulator from 9V too.