His name is Diesel...
and he works/naps at Second Life Bicycles in Leiden. The store has a small but wide selection of used bicycles at very reasonable prices. They have a high turnover so if you don't find what you want the first time, it's worthwhile to visit again in a few days.
The store is in an alleyway called the Vrouwensteeg, between the Breestraat and Boommarkt. It opens at 9am most days of the week.
The storefront has bicycles outside, but be sure to look inside as well!
That's where Diesel will be. How can anyone resist?