The easiest way to unlock the jet-setter is to restrict all the rooms and have all guests directed to the type of room you heave the least of. Have as many guests as you can at once. The guests will be turned away because there isn't enough room and they will give 0 stars allowing you to easily unlock the jet-setter. After you unlock them you then unrestrict the rooms, and direct the guests back the same way you had before with limited loss.
It's weird, last time I played this game it worked fine, now it's a buggy mess. Either I remember it wrong or something went seriously off in the code.
The spy feels a bit overpowered. Because of the small sight area, and poor AI you can take out tanks by just being a little bit away and spamming attack and it will constantly stay in place while you kill it. The rifleman enemies won't attack you even if you're standing in plane sight so you can take them out in your own leisure. In the original game the melee attack worked very well because of your squishy nature and stealth mechanic it was a very good risk vs reward. You can take out almost all the enemies with just the spy but it's not quite as fun because there's very little challenge. It honestly feels like a step back to me.
I like this game, but a few things that I think the previous one did better. For example the side abilities feel a bit cluttered. I miss upgrading items to unlock there special power, it always felt so satisfying. Also I miss the Soul Eater sword, it was always one of my favorites. Other than that this game is better than all the other ones before it. I look forward to seeing what you have planned for your next installment.
 "Innkeeper"){kind=icon}
 "Shop Empire 2"){kind=icon}
 "Monster Arena"){kind=icon}
 "City Siege 3: FUBAR Level Pack"){kind=icon}
 "Epic Battle Fantasy 4"){kind=icon}