The summer school will be held at Department of Mathematics, Ny Munkegade 118, and the Aarhus Institute of Advanced Studies (AIAS), Høegh-Guldbergs Gade 6B.
To Aarhus
Aarhus can be reached by train or plane (via Aarhus, Billund, or Copenhagen). The railstation is located in the center of Aarhus. Getting from Aarhus Airport to the city center takes about 50 minutes by bus (90 minutes from Billund airport). While tickets for airport buses can be purchased from the driver, tickets inside Aarhus can only be purchased in the Rejsekort App.
City center to AIAS building
Both the Department of Mathematics and the AIAS are located at 20 minutes walking distance from the city center (30 minutes from the station). Alternatively, you can take Bus 1A, Bus 14, Bus 17, or Bus 33
There are a variety of hotels in Aarhus. For instance, there are the following options
Scandic Hotel Aarhus Mayor - https://www.scandichotels.dk/hoteller/danmark/aarhus/scandic-the-mayor
Cabinn Hotel Aarhus city centre - Located in the centre of Aarhus with reasonable prices more information see here.