Grand Austria Hotel is so fucking good and the expansion makes it even better. It's probably the perfect mid-weight euro.

I'm usually not keen on modular expansions, just adding detached elements that you can add or remove makes me feel like combining most modules together won't work well and therefore the designers had to separate their ideas into modules in order to make the ideas work. But GAH's expansion really shines with whatever combination you decide to use, I was expecting the dance floor module would deviate too much from the game's main focus of filling your hotel but I'm very impressed about how it seamlessly integrates champagne and dancer bonuses, doesn't make it any less tight too, which is fantastic.

As a counter example, Food Chain Magnate's expansion modules (17 of them) feel mostly like undercooked (no pun intended) ideas that they put in the box just because they came up with the name or concept and lazily added some mechanics to it; including all these is probably not feasable at all and even if it was it's probably completely broken.
The "Ketchup" module ironically is the worst one, since good players can play in a way they get it to abuse it and beat the player that actually needed the catch up mechanic even harder.