I had not realised that check in was only allowed until 20:00. I was meant to arrive into Paris at around midnight and I only noticed the restriction to the check-in time at the very last minute. I wrote to the host but I got no reply through AirBnB. Just when I was starting to panic, I found her number on AirBnB and called her. The host was initially firm that I could not check in after 20:00, but when I explained my situation, she was helpful and gave me the phone number of the actual hotel consierge. The consierge consented to letting me in at around midnight and was incredibly helpful and accommodating. The room is elegant and very clean although a bit barren. No TV and a bit cold during the night, but I am happy with just reading a book and once I got the radiator to work, I was happy. Good location for Montmartre and very close to the Metro Simplon : )