I'm making this thread a wiki since there are issues that keep getting repeated (breakfast and transportation from/to CDG). Feel free to add whatever you feel is important - stick to facts of please and not one off exceptions (eg if you get an upgrade to the Presidential Suite on an award stay without any status - that's definitely a one off that doesn't belong in the WIKI - obviously you can do a regular post on it).

Public transport to the hotel from CDG

The best option is to take the Roissy bus to Opera. From there, the hotel is about a 5 minute walk.

The next best option is to take RER B to Chatelet-Les Halles. All trains from Roissy/CDG head south into Paris so no worries there. Some go express all the way into Paris (Gare du Nord, so Chatelet-Les Halles is the second stop); others are locals, in which case there are a lot of stops; some are half-express, half-local ... but all stop at Chatelet-Les Halles; and there is no point waiting for an express because it is rare if ever that an express will overtake a local. So get on whatever comes first. At Chatelet-Les Halles, transfer to RER A for one stop to Auber (which is joined to Opera station). You will be heading westbound, toward the termini St. Germain-en-Laye/Poissy/Cergny. You have to go up the stairs and back down for the Auber-bound train. Do not race across the platform for the RER B because that will be heading eastbound, to Gare de Lyon, Nation, Vincennes (and, depending on which one you get on, eventually Eurodisney!) The walk from the Auber exit closest to the RER stop takes about 10 minutes.

Public transport to the hotel from Orly

Take the Orlyval train to its end at Antony, then switch to RER B to Chatelet-Les-Halles and continue as above. In this case you can just cross the platform from the RER B to get the RER A headed to Auber.

Breakfast

The breakfast at Cafe Jeanne is free for Globalist members but is 40-50 euros per person otherwise. A modified but still very good version of this buffet breakfast is also available in the room and is also free for Globalists. Tips are not covered but then again the theory in France is that the service charge is in the price.

Museum tickets & pass from the concierge

You can buy "skip the line" tickets to the Louvre or Orsay for 18€ each, which is higher than the regular tickets via the Louvre & Orsay websites. But being able to "skip the line" obviously adds some value. They will also sell you the two day Paris Museum Pass for 55€. That is a 7€ markup.

Phone/data recommendations:
Lebara worked really well for me. What you need to do:
• You must unlock your phone (you can do this for free online with ATT through their website if you are out of contract)
• Order free SIM card at Lebara.fr a few weeks before your trip. I don’t think it took more than 2 weeks for my SIM card to arrive
• Activate SIM card at https://www.lebara.fr/activate-sim-detail?isoCode=en_GB or search “activate SIM” at Lebara.fr
• Load your SIM card with what you need. I paid 10 euro for 3G of data, unlimited SMS and local calls for 10 days (this should be plenty for most tourists)
LeFrench Mobile did not work so well for me: I paid 20-30 euro for local and international calls for my sister but was only able to make local calls and SMS

restaurant recommendations:
Nearby:
(We're here on 1 Oct 2021 and it appears this restaurant is closed permanently ...) Le Cap Bourbon- good, inexpensive, our server was nice and attentive (by French standards), great local crowd, menu has English translation
We ate a local Thai restaurant - Yo - its about a 5 minute walk from the hotel and very busy. I had a guinea fowl green curry - a first for me. Very good food and friendly service.

Other:
L'Avant Comptoir is a wine bar with great,relatively cheap eats and a great atmosphere and friendly, English-speaking staff. Standing room only and tight.