I have stayed at Les Armures maybe ten times now, and it is my first choice in Geneva.
It is the epitome of how a hotel should be, in my humble-ish opinion: it just exudes class (and I admit I'm not quite sure why!!)
The rooms will seem small by US or Asian standards, but are probably bigger than average for a city-centre traditional Euroepan hotels. The beds are firm but incredibly comfortable, although the pillows are a bit soft. The clean, spacious and well-lit bathrooms come with a nice selection of toiletries and a magnifying mirror.
It all says "luxury" but very discreetly.
The hotel is in the old town and it's a steep walk up or down coblled streets to get to the main throughfares, but it's worth the effort to savour the quiet, efficient service, the unassuming luxury and the old-world atmosphere.