From the main station to the hotel

Accommodation will be provided at the A&O Hotel Hamburg Hauptbahnhof, located a short walking distance south of the main station (Hauptbahnhof) at Amsinckstrasse 2-10.

From the hotel to the Institute

The lectures will take place at the Geomatikum. The simplest way to reach it from the hotel is to take the subway line U2 from "Hauptbahnhof Nord" to "Schlump". "Hauptbahnhof Nord" and "Schlump" are a short walk distance away from the hotel and institute respectively. Alternatively, you can take the train line S from "Hauptbahnhof" to "Sternschanze". A single ticket is 1,90 Euro while a weekly pass is 16 Euro.

If you'd rather use a bike to get around, it's probably easiest to use the Stadtrad system. There are Stadtrad bike stations available both in Amsinckstraße (next to Nordkanalbrücke) and at Schlump, so you won't have to walk far to pick up a bike.
It's also possible to rent a bike for the week, for instance at Fahrradladen St. Georg (close to the hotel) or at Fahrradstation Dammtor|Rotherbaum (close to the university).