PDD has a list of Wi-fi Hot Spots, but it hasn't been updated much in recent years. If anyone has any additions to the list, make it known and we will make those additions/changes.

Chester Creek Cafe is the best place I can think of that meets all the criteria above. You'll want the table in the back part of the restaurant, surrounded by bookshelves.

Sir Benedict's would be my second recommendation. The area away from the bar, near the restrooms would separate your group enough from the rest of the crowd. I just learned yesterday they have pizza at Sir Ben's, and it looked pretty good.

Clyde Ironworks is probably great for this type of thing as well. I can't remember offhand if I've ever tested the Wi-fi there, though, so I can't vouch for that element, but it's probably fine.