Shuttle Express is who we use, and to the same general area. We have been using them for years and so far have never had any issues.
If he doesn't want to drive into downtown Bellevue, you can take a bus from the Bellevue Transit Center to Cascadia Community College in Woodinville Bothell. It is a sort of transit hub too. The shuttle is a good idea but I have never found them affordable. Am I missing something, Mtngrl?
here is a list of hotels that Shuttle express has a pre set fare. Much cheaper than the 'door to door' price. They do go to Monroe but perhaps the kirkland location would be better. You have to leave at the set time and when you get to seatac make sure your asking for their 'scheduled service'
ainwa--As David posted, it can work really well. We have done it several ways and even with the higher rates have always found it is very much worth the money. We are using it again shortly. I hate to ask family to pick us up when we get back to the airport at a late hour and we never leave our cars at the airport, so it works for us.