This place is perfect for a single traveler or couple. Super clean--REALLY quiet. Very secure. There's a heavy front door to the apartment building that requires a code, followed by a second door, and then finally the apartment is on the top floor.
Perfect location--within walking distance of everything in Le Marais, which is (in my opinion) the best neighborhood in Paris. Great shopping (small boutiques), restaurants, bars. Not rowdy--more hipster.
The owner uses a service to run everything and they are INCREDIBLY responsive. Responded to my emails within minutes before my trip, and then responded within seconds on WatsApp during the stay. They also met me early before my check in to let me drop my bag. There's a giant book of recommended tourist stuff to do...and I mean...GIANT.
Bed was super comfortable. You really can't go wrong with choosing this place.