I am a regular at the Frankfurt Marriott, usually over weekends. The Exec Lounge is normally closed at weekends but they do open it if there is a convention in the hotel or a big trade fair across the road. Three weeks ago the lounge was open on the Friday evening but the food offering was dreadful. No hot food at all.

Also, be aware that spirits are not on offer here, unlike other German Marriotts. Beer, wine and soft drinks only.

In response to Boraxo, I have only stayed at the LM once, several years ago, and was not that impressed. I'm afraid I can't remember any specifics.