A really noteworthy location! The apartment is literally across the street from the Louvre, and literally across another street from the Seine! It's a block from Rue de Rivoli, and incredibly easy to access many of the major tourist sites in central Paris. Additionally, the responsiveness from the Sweet Inn staff is great, and since this apartment is right above their office, it felt like we had access to them all day if needed.
The apartment itself is quite spacious, with a functional bathroom (modern and well designed, albeit in a narrow space). There is a one flight walk-up to get to the apartment. The kitchenette is nice, with a full sized refrigerator and sink, and a washer/dryer. The washer/dryer is a combined unit, so the heat isn't robust, and the drying cycle takes a while, but it certainly works. Big windows line one wall, in the main room and the bedroom, giving a nice view of the city and river.
A note: the apartment is right in the middle of the city, so there is a bit of standard urban noise. Traffic, sirens, etc. The windows seems fairly well insulated, but there is a din of activity coming from outside. If you are used to a very quite place, this level of ambient noise might be too much. My wife and I live in a city, so it didn't bother us. (And the sirens sounded charmingly different!)
Also, we found the bed to be a bit firm. If you are used to a very soft mattress, this one might be on the harder side for you.