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Address
Wolfgang Löffler 
Leiden University
Huygens Laboratory, HL906
Niels Bohrweg 2
2333 CA Leiden, The Netherlands
phone: +31-(0)71 527 5931
e-mail: loeffler@physics.leidenuniv.nl
web: http://quphotonics.org
Wolfgang office: room 906 (9th floor), Huygens building
Office hours
Also because of the tight lecture schedule in Leiden, Wolfgang doesn't have regular office hours - simply send a brief informal email when you want to meet me (probably check my agenda) and we'll manage! Or drop by on the 9th floor Huygens between 12:30 and 13:30, then we usually have lunch.
Directions
Note 2025: Unfortunately, there is a wrong “Huygens laboratory” in google maps, this is correct: https://www.google.com/maps?q=huygens+laboratorium+leiden
From Leiden Centraal: Google cycling (20-25 mins by foot), Google public transport, ns.nl link
The situation in January 2023, with 2 walking routes in red:
The main entrance is at https://plus.codes/9F465F95+98Q, the revolving door at the north side (SRON) at https://plus.codes/9F465F95+H6, and the sliding door for deliveries is at https://plus.codes/9F465F95+C69.
By car
Call us before, parking policies often change! Starting from summer 2022, visitors have to park in the wooden Ehrenfestgarage (2eur/h, or you send us your number plate well in advance)! https://plus.codes/9F465F85+FM