Just back from a long weekend in Prague staying at the Mandarin Oriental under a FHR with a 3 for 2 nights offer too.

Booked a Delux room (no view) and was upgraded to a junior suite. Normal FHR promotions were honoured with the exception of the guaranteed late checkout which was refused - based on our timetable then 4pm wouldnt have been much more useful and so didn't argue it with them.

Fantastic peaceful hotel in a former monastery a few minutes walk from the Charles Bridge. Staff were excelent, especially the concierge (though our requests weren't too challenging). Fun little presents (cake, easter eggs etc) left each night - though the Mrs didn't appreciate the traditional Czech easter whipping stick (pomlázka)

Only oddity was when booking a tour via the concierge they advised I had to pay by a card other than AmEx due to AmEx rules... no issue for me but just seemed odd.