I came to Paris for a long, business weekend (but with some fun added in) and Marie's apartment was simply perfect. It's in a great neighborhood (Republique, close to the Marais). I walked a lot, but you're also close to two Metro stops (Republique and Oberkampf). And while the neighborhood is lively, the location of her apartment is very quiet.
She has a real (not a convertible sofa) bed that is very comfortable. The apartment has great, comfortable style. The water pressure is fantastic in the shower. Her kitchen is well stocked. And the wifi worked wonderfully.
And if I needed anything, Marie was easy to reach via whatsapp message (She was away when I was there, but arranged for super-convenient retrieval of the keys). I could not have asked for a better host or place and would definitely look here first when I have another trip to Paris.