Make sure that you take the exit to Switzerland (and not the one to France.
Take Bus50 and exit at bus stop Kannenfeldplatz. Follow Metzerstrasse and turn left into Klingelbergstrasse,building no. 80 ist on the right side.
Alternatively, taxis are provided at the EuroAirport.
By Train / Bus
Station SBB (Schweizerischer Bundesbahnhof)
Leave the station at the main entrance and take tram line 11 with direction to St. Louis Grenze. Exit at tram station St. Johanns-Tor and follow St. Johanns-Ring, turn left into Klingelbergstrasse, building no. 80 is on the left side.
Station Basel Badischer Bahnhof
Take bus line 30 and exit at bus station Kinderspital. Follow Schanzenstrasse (in the same direction as the bus you just exited) and turn right Klingelbergstrasse, building no. 80 on the right side.
With direction from Switzerland or Germany
Leave the motorway at exit Basel Badischer Bahnhof and follow the signs to Universitätsspital. After crossing the bridge Johanniterbrücke turn right into Elsässerstrasse. At the town gate St. Johanns-Tor turn left into St. Johanns-Ring. Turn left into Klingelbergstrasse, building no. 80 is on the left side.
With direction from France
Leave the motorway at the border to Switzerland and follow the signs directing to Bahnhof SBB until you reach Kannenfeldplatz. Turn right into Metzerstrasse and then turn left into Klingelbergstrasse, building no. 80 is on the right side.