Update on our irrops: (sorry for the delay, we have had limited internet until now)
We went to the desk at CDG and spoke to a lovely woman who arranged a hotel with dinner and breakfast included. She told us it was a 4-star "wonderful" hotel.
Not so.
I would say perhaps a 1 or 2 star Tourist hotel. No proper restaurant. The voucher covered dinner: "Select 1 tub or box of processed food from the fridge, 1 dessert and 1 drink. Microwave available". 2 tables in the lobby. One could also order pizza (edible). Buffet breakfast available but we chose to eat in the lounge instead. To be fair, they gave us a very spacious room. Welcomed by cobwebs above the entrance door. No glasses or cups, paper cups available at reception. Kettle/coffee machine that didn't work. Return shuttle in the morning every 2 hours. The staff were pleasant.
(B&B HOTEL Paris Grand Roissy CDG Aéroport)

Lesson learned: avoid the customer service desk, book your own hotel that you're happy with (within reason) and claim afterwards, even if it's a little work.
I was hesitant to refuse the voucher after it was issued as I wasn't sure if they would make a note and dispute my claim amount later.

Not a happy camper that evening but our first day in Antananarivo there was a general strike, protests in the streets and a whiff of tear gas in the air so it put things into perspective.

Safe and happy travels everyone!