Thanks all. My wife found a place in the 5th near the RER station (handy to get to CDG for the flight home). Saw that there's a supposedly-renown place called Les Deux Magots nearby but it's already booked (or maybe not open) and expensive for what it is to boot (I may be surprised, because I hardly eat out these days). I'm quite sure there must be other places as hotel prices are quite elevated (compared to days/weeks before/after) so there must be sufficient customer traffic.

I take it the Métro operates on a reduced service schedule?