‘Cozy’ is an apt description. The flat is small but comfortable. Single room living area with bed, wall storage unit, round table with 2 chairs, kitchenette. Separate rooms off the entranceway for toilet and shower (no bath). The flat is fine for one person, ok for two so long as they are traveling fairly lightly and are comfortable sharing the bed.
It is a bit of an exercise to initially gain entrance — outer door code, lock box for key, inner courtyard door, apartment door. The owner, Leo, emailed excellent directions beforehand. I needed a flashlight (my iPhone light) to open the key lockbox, which is in the unlocked mailbox inside the door to the street.
The flat is generally very quiet. A courtyard is just outside and in the morning you will hear anyone rolling a suitcase over the cobblestones. It has good curtains to block light, so it affords a good sleeping environment in cool weather (I don’t know how it would fare on a hot night). It is on the ground floor, so no lugging a suitcase up flights of stairs.
The kitchenette has the basics — sink, range with two heating elements (no oven), mini fridge, coffee maker, electric kettle, bowls and utensils. There is a washing machine but no dryer, so no doing laundry the night before departure. The owner provides a drying rack in the toilet room but it took 30+ hours for my jeans to dry. There were no manuals that I could find for the appliances but I was able to locate instructions for the Siemens washer on Google. The internet connection was excellent.
The flat is on a somewhat nondescript street, quiet but not much going on. Rue Bretagne is just a short walk to the north, however, and affords cafes and shopping (including a nice supermarket about 1.5 blocks to the east). Another 2 short blocks north you find the Place de la Republic, which has access to a quartet of Metro lines. It is about a 13 minute walk south to Rue de Rivoli and the Hotel de Ville. Another block takes you to the Seine, opposite Ile de la Cite and Ile St Louis.
All in all, a very nice accommodation and location for a single traveler or a non-elderly couple. It is not a space in which to hang out but a good jumping off point to explore Paris.