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The Bergère Opéra Best Western is okay, it is quite near the Opera Garnier and the famous large department stores at Grands Boulevards. All department stores are closed at 7:00 p.m. in Paris but there are a lot of coffee shops, restaurants, theaters, cabarets nearby for tourists and locals. The area is safe in the evening.
When you arrive Paris from London by Eurostar, you are in the metro Gare du Nord, follow the metro sign and take line no. 4 direction Porte d'Orleans and change at the station Strasbourg St. Denis, you take line no. 8 direction Balard and get off at the station Grands Boulevards. It sounds complicated but ask for a metro plan at the information desk, you can see you only have 5 stops, and the hotel is about 2 minutes walk from the metro Grands Boulevards.
There is a Roissy bus at the Opera Garnier (angle rue Scribe and rue Auber) from 6:00 a.m. to 23:00 p.m. to Charles de Gaulle Airport (CDG), it leaves every 15 minutes from 6:00 a.m. to 19:00 p.m. and from 19:00 p.m. to 23:00 p.m. it leaves every 20 minutes.
It costs 8.50 euros and it takes about 45 minutes to 1 hour (or more) from Opera to CDG depending on traffic congestion.
Alternative solution to go to CDG, you take the RER (Super metro) line B3 at the metro station Gare du Nord, you need a special airport ticket which costs 8.20 euros, and it takes about 30 minutes.
You can buy your ticket at the station Grands Boulevards, just ask for a ticket to CDG Airport, you use the same ticket for the metro and change at Gare du Nord with the connection RER B3 direction CDG.
CDG has two terminals (aerogare): 1 and 2. If you happen to get off at the wrong terminal, they have a fully automatic train called CDGVAL which is free and it runs between CDG1 and CDG2 in 8 minutes.
Hope the above helps and have a nice stay in Paris.