Way from Cityhotel am Thielenplatz to the university:
It is a 30 minutes straight walk from Cityhotel am Thielenplatz to the university. Starting at Thielenplatz follow Theaterstraße and Rathenaustraße to Kröpcke. From Kröpcke just follow Georgstraße westwards to Lange Laube until you hit Nienburgerstraße. Continuing on this street you will find the university’s main building (Welfenschloss) to your right.
Alternatively, you may take the streetcar at the station Kröpcke (it is underground) to get to the university. From the tram stop Kröpcke you will reach the University within about 5 minutes (3 stations). Take the City Railway, route 4 toward Garbsen, or 5 toward Stöcken. You only need a short-range ticket ("Kurzstreckenticket", 1,50 EUR).