To reach us by public transport:
From Cologne Central Station/Köln Hbf (Hauptbahnhof) exit "Breslauer Platz". From this exit you have the U-Bahn and to the right of the station is the bus depot. If taking the U-Bahn, take line 16 towards Sürth Bf and exit Chlodwigplatz. From there cross the tracks/street and continue south on Bonner Straße for approximately 950m (12 mi.) until you reach a large grass triangle opposite of the McDonalds. At the end of the grass triangle is Sechtemer Straße. The buzzer for the door to go up to the school is next to an office on the far right side of the building just before the end of the street. From the bus depot at Cologne Central Station/Köln Hbf (Hauptbahnhof) you take bus line 133 (16 min.) or 132 (18 min.) to stop "Bayenthal Market Straße". From the stop go towards McDonald's, but stay on the right side of the road. Walk past the large grass triangle and turn right onto Sechtemer Straße.
From "Heumarkt" you can take bus line 106 (13 min.), 132 (14 min.) Or 133 (12 min.). From line 106 get off at stop "Bayenthal Bonntor" (by McDonald's), cross over to the other side of the Bonner Straße and again the door to go up to the school is next to an office on the far left side of the building on Sechtemer Straße at the end of the grass triangle.
From "Köln Messe/Deutz" best to use tram line 3 (towards Mengenich) or line 4 (towards Bocklemünd) and exit at stop "Severinstraße". From there you can transfer to the uderground line 17 to stop "Bonner Wall" and exit Sechtemer Straße. Or you can get bus 106 from "Severinstraße" to "Bayenthal Bonntor" or 132 to "Bayenthal Market Straße". Another alternative from "Köln Messe/Deutz" is to take tram 9 towards Sülz Hermeskeiler Place and exit at stop "Heumarkt" and then change to bus 132 or 133 to "Bayenthal Market Straße".
Tip: If coming from Cologne Central Station/Köln Hbf (Hauptbahnhof), bus line 133 is a nice scenic route that passes along the Chocolate Museum and the Rheinauhafen with the crane houses.
Have a good trip!