Fire alarms are annoying but they're also part of life if you want to sleep/eat/do business indoors. It's unfortunate that the alarm went off twice, and it's unfortunate that your evening was disturbed, but I really don't see how that would justify compensation. And just because TripAdvisor mentions the same thing happening, doesn't mean it's happening in vain. If that is the worst thing that happened during your trip, it's still a really good trip and nothing really worth complaining about.