This place is unbeatable, location, accommodation, everything. I loved opening the windows on warm nights a watching the world go by. Seriously best location with everything at your fingertips.
Make sure you have phone connectivity when you arrive as they arrange entry via phone call (my UK SIM card would not work). Explore the Marais area, and get amazing crepes from the vendor with the blue window around the corner. Also take bus 69 from Rivoli Street and see all the best monuments right up to the Eiffel Towel for the cost of one metro ticket.