Guillaume is a wonderful host, we loved the diverse and lively neighborhood and felt safe exploring the area. Alas, my husband and I could stay just one night on the mattress provided. Though the size is narrow, it was actually the thinness of the mattress that caused our discomfort. A single person might do just fine as there was an extra mattress in the loft that could be pulled down and used on top of the pullout for comfort.
Otherwise, we were prepared for the stairs to the 4th floor (they are tight) and we were greeted with a delicious bottle of wine Guillaume had left for us on the table. Other amenities were quite suitable and the flat was clean and tidy.
Any information we needed and any communications from Guillaume were timely and precise and eased our first journey to Paris.