Today was my second day at Caza V1 serviced apartments and it was laundry day.
I think you can do it any day you like.
I dropped off 15 items this morning on my way out to get the phone fixed.
The lady said to come back at 4 pm.

I went back at 4 pm and all of my clothes were neatly folded in this plastic bag.
I then headed to reception and listened to the laundry girl talking to the desk staff and explaining how many items and what they were.
After quite a conversation I got the bill.

The grand total was $4.44 Australian or as I like to say Gow Sib Ha baht.
I will continue to get my laundry done here.
Some items are more expensive to wash so it wont always be this low.