This is a stunning, to-die-for apartment in the heart of the 3rd arrondissement. It's spacious, with good sized bedrooms and beds. The bedrooms are set in the back of the apartment away from the (already quiet) street, which is an added benefit. The decor is high-end, and the amenities are sparse but adequate. (The management service offers toiletries and cleaning supplies for a fee.) There are two showers, but only one toilet. (My parents and my aunt and uncle for whom I rented this apartment were surprised at this.)
The location: It's walkable to Republique and other metro stops, and there are many great restaurants, bars, shops and markets nearby. It's a great location for exploring Paris.
The service: The management company who checked us in was very responsive and professional. They explained how everything in the apartment worked, replaced a broken coffee machine in just a few hours, and were generally friendly and patient.
This place is absolutely worth a look if you have two couples who would prefer to have a great apartment instead of hotel rooms during their Paris visit.