The Rostock public transport system consists of trams, busses, and S-Bahn (local train). The same ticket is valid for all of them. The price for a one-way single ticket is EUR 1.70 (valid in the relatively large central part of Rostock), and a ticket for the entire day "Tageskarte" is EUR 4.50. Taking the S-Bahn from the main station to the conference location Parkstrasse is only one stop, and a "Kurzstrecke" for EUR 1.40 is sufficient. Tickets may be purchased at many vending machines and certain kiosks.
All sessions of the conference will take place in Ulmenstrasse 69, Haus 3. This building houses the math department, and is a different building from the one you may be used to from previous conferences in Rostock. The building is a little distance away from the road, overlooking the campus green. Haus 3 is the large red brick building *without* large trees in front of it.
There is plenty of free parking on campus. Enter the campus from Ulmenstrasse and go passed Haus 3 along the campus green. Parking is at the end of this road.
The locations can be seen here.