Here is a link to a map of the Yellow Flat's location:
http://maps.google.com/maps?f=q&hl=en&geocode=&q=9+rue+alasseur+paris+fr&sll=37.0625,-95.677068&sspn=51.310143,83.759766&ie=UTF8&ll=48.864545,2.281809&spn=0.042008,0.081797&z=14&layer=c&hcbll=48.855759,2.287608&panoid=qj73CeRqHQoVWOZnrZUZfg