Marguerite's place is perfectly located in Le Marais. My wife and our 11 months old daughter stayed in Paris for 8 days during Thanksgiving week. Given it's not our first time in Paris, we just want to enjoy the food and live like a local while avoid the tourist crowd. The location was perfect to many great restaurants and shops and we were able to walk to places for the majority of our trip. (Including Centre of Pompidou, Picasso museum, and more). It's also close to major metro stops(arts et métiers) if you like to venture out a bit.
The apartment itself is as pictured and not big so I would say it's ideal for 2 people. We had to make do with a baby and it was not easy (I guess it's never easy traveling with a baby).
The sofa is a bit small and doesn't have a proper sofa cover( Marguerite is getting new sofa soon so I am sure it would be much nicer) but we spent most of our days outside sitting in a cafe enjoying coffee or eating. Also please note it's on 3rd floor without elevator. (Again not an issue for me but my wife would avoid walking stairs multiple times a day is possible).
Overall I would recommend Marguerite 's place to anyone visiting Paris. It's similar to staying in New York's Tribeca area in my opinion and allowing you to really enjoy Paris' vibrant restaurants and shops.