Everything was so easy. We could check in at 10am when we arrived in Paris. Our room was just one part of the appartment that Sophie owns. We had our own bathroom and were allowed to use the fridge and almost everything else. We had our own key. We came home late every day and this wasn't a problem at all. Sophie and her husband Alain are really friendly hosts. I highly recommend to stay here if you don't want to spend to much money on a hotel room. Further the appartment is really close to the main station "Gare du Nord" and the most important Metro station "M4" ist just across the street of the main station. It will take you to almost every sight.