I highly recommend staying in Bernard’s apartment when going to Paris. I spent there one month and I have to say it is a very comfortable flat of a high standard. All necessary amenities included.
Location is superb! Walking distance to all major tourist attractions. Apartment is in the 3rd arrondissement - a beautiful district, well connected through the major RER, metro and bus transit station - Châtelet -Les Halles (direct RER B line to the airport).
Bernard, the host of the apartment is very kind and helpful in case of any needs. He is available and responds to messages quickly.
A month long stay was beyond my expectations!