My sister and I stayed at Gilian's apartment for two nights, and I have to say our first impression was rather negative. After everything had been arranged and booked we were told, two nights before arriving in Paris that we would not be welcome at the apartment until the evening. We then had to wait around for over four hours, until our host was ready.
After this wait, we found the apartment unpleasantly filthy. The floor was so dirty we couldn't walk around barefoot. We had to clean before we could relax, not something you want to do when paying for accommodation! A drying rack was left in the middle of the main room covered in soaking wet towels, taking up most of the room. I understand the need to wash the laundry, but maybe it'd be best to do this 'out of house' if a guest is staying.
Apart from all of that, the apartment itself was lovely. The private entrance is ideal, and feels really safe. It is really quiet, especially for Paris. The bathroom is modern and well spaced. The bed is comfortable, yet it is a little daunting to climb the ladder at first! However it doesn't take long to get the knack of it.
The kitchen is minimal, and lacking in some details (no cafetiere!), but it was fine. Storage is another little problem, there is nowhere to hang or store your clothes and belongings...
The placement of the apartment was great, just a quick walk to the Marias, and really close to the Eurostar Gare du Nord.