If you are coming from Nuremberg, you can reach Munich via the Autobahn A9. The Autobahn A8 will take you to Munich from the directions of Salzburg or Stuttgart.
Follow the Autobahn road around Munich (Autobahnring A99) until you reach the intersection Autobahnkreuz München Ost. Take the Autobahn A94 from here in the direction of Passau and leave the Autobahn at the exit 10 Anzing/Markt Schwaben.
You follow the road to the center. Then turn left into the Gschmeidmachergasse approx. 20 meters before you would reach the church.
The suburban train S2 in the direction of Erding leaves Munich Central Station every 20 minutes and will take you directly to Markt Schwaben. The Gästehaus am Turm is approx. 800 meters from the train station.
If you arrive at the airport MUC, there are 2 ways to get to Markt Schwaben using public transport.
The buses 512 go from the airport to Erding several times a day. From there, you can take the S2.
Alternatively, you can take the S1 from the airport to Munich East or the S8 to Leuchtenbergring where you can get on the S2 to Erding/Markt Schwaben.