The MHOP address is Boltzmanngasse 9, 1090 Wien.

To reach MHOP, take any of the 37, 38, 40, or 41 Straßenbahn two stops from Schottentor to Spitalgasse.  Walk back one block in the opposite direction of the tram to Strudelhofgasse and turn left.  Go one block to Boltzmanngasse and turn left.  

The entrance is a large brown door across from the U.S. Embassy at Boltzmanngasse 9.  

Go up the entrance stairs, and then up the stairway on the right.  

On the top floor, turn left, and go through the glass doors.

The people who walked in darkness have seen a great light;
those who dwelt in the land of the shadow of death, upon them a light has shined.
(Isaiah 9:2)