Shortened link
The link you followed has been shortened with is.gd. Shortened links can go anywhere on the Internet so you shouldn't continue if you got the link from a suspicious source e.g. junk email.
The full original link is shown below. Click the link if you'd like to proceed to the destination shown: -
https://maps.google.de/maps?q=Thomas-Mann-Stra%C3%9Fe+2,+Berlin&hl=de&ie=UTF8&ll=52.54286,13.442341&spn=0.001674,0.005284&sll=52.542945,13.442467&sspn=0.000843,0.002642&t=h&hnear=Thomas-Mann-Stra%C3%9Fe+2,+10409+Berlin&z=18
Tip: some QR readers fail to read mixed case URLs properly. We recommend using the lower case option or a lower case custom URL with QR codes.