The flat itself is really well equipped and looks very stylish. We are 3 tall guys, all over 6 feet/182cm and stayed there for 5 days. Even if the bed looks big, it's probably to small for 2 guys. On the other hand, the sleeping couch is big enough for 2 guys. I can recommend this flat for sure, but it depends on what you are planning to do.
If you are planning on partying/visiting nightclubs near Arc de Triomphe and Champs-Élysées or know that you are going to be a lot near the Eiffel Tower, you have to consider that you need 30 mins to the Eiffel Tower by Metro. Especially at night at 4 it's not that easy to get home.
If you just want to explore the whole city by daylight and don't need to come back several times during the day, this flat might be the perfect fit for you.
The location is okay. It's not the cleanest part of the city but it's fine.
Lastly, I have to say that Sandrine is a really kind host and even let us stay some hours longer, so that we could use our last day in Paris and take our bags 6 hours after the official check out.