The positive lab test must be 10-90 days prior to the cruise. Sounds like your partner won’t be able to cruise unless they test negative between this coming Friday and Sunday.
I would advise bringing an extension cord to make sure the cord on your CPAP machine reaches the power outlet. Especially in older ships, there is usually only one outlet, on the desk.
If you have few things that you really want ironed, you can send then out for “iron only.” They charge per piece, but it’s less than if you had them washed and ironed.
There is business called Bagsaway that has several locations in Seattle, including downtown areas. Here is a link to their website. This must be pre-booked on-line. https://bagsaway.com/luggage-storage/seattle