We enjoyed this stay a lot. The apartment is small but laid out in a very intuitive way using space very well. Beds are comfortable and I liked that they were murphy beds so we could put them away in the morning to use the space better. The location is amazing. I liked the street we were on, close to transport and many stores. I preferred to walk down the hill (away from Moulin Rouge), the neighborhood down that way seemed much cleaner/more like Paris.
We had three of us sleeping in three of the beds, there was a fourth one that was a loft. I did sleep up there one night but the summer temps even with AC made it a little too hot. I am sure most of the year this loft is fun to sleep in. Just something to keep in mind if you are pushing it to 4 or 5 guests in August hot months. The beds were cool, even had USB ports and reading lamps at each bed. Sound system was nice for Bluetooth music in the evening while enjoying wine.
If your phone works, getting around on train/bus is easy. Use the public transportation button (bus icon) in Google Maps and it will give you the public transportation directions. To get to Versailles was also very easy on train/bus. We took the Gare Saint-Lazare metro stop (subway) to the Viroflay Rive Droite. Transfer to the bus, there is signs to bus 171 from Gabriel Peri, ride all the way up to Chateau de Versailles. I recommend booking the 9am time slot so the bus is more empty.