JW does not have self-serve laundry on-site AFAIK. Having said that, he website says it has laundry on-site, but I don't if that actually means a washing machine/dryer. (which would surprise the heck out of me given the calibre of JW). My suggestion would be to contact the property directly in advance.

There is a service in London called

https://www.laundryheap.com/?gclid=C...FUwkgQod-CEKtQ

that can handle things, but don't know how pricing stacks up.

AC Marseille doesn't seem to have on-site laundry (which does surprise me a bit given it's a AC).

Cheers.