You will find a fully cleaned unit complete with fresh towels when you arrive. If you stay less than 8 nights, you will receive "Trash & Towel" service on your fourth day. That means housekeeping will take out the trash and provide fresh towels. If you stay 8 nights or longer, you will receive a full cleaning on the fourth day and Trash & Towel Service on the eigthth day. The one, two & three bedroom units have a washer & dryer right in the unit. There is a laudry room availabel for those who stay in the studios (no charge for the use of the machines, but you must pay for/provide your own detergent and softening agents).
If you want cleaning services beyond what is described above, then yes, there is an extra charge. It varies depending on the unit size and the service requested. When the search function is available, do a search. There a quite a few posts that detail the services & charges. Briefly, T&T is $10/day requested. Full cleaning is $25/day reuested for a studio, $30 for a 1 bedroom, and $40 for a 2 bedroom.
Most members (me included) really LIKE not having housekeeping in the room on a daily basis. It's not a big deal to make the beds and wash a load of towels every so often. (We don't use a clean towel every day at home). We don't have to worry about when the maid is coming, taking a nap, putting our stuff away or sleeping in. At first, it seemed like the lack of daily housekeeeping was a negative. After having tried it, I find that I actually PREFER not to have it. JMHO. YMMV.
Hope you didn't mind the lengthy answer.