The good: central location, just on the edge of Montorgueil. Very friendly people at Sweet Inn, who really try to help with small apartment problems. Nice enough space, small but big enough for two peoplemwho travel closely together. Really good, comfortable bed, well equipped.
The bad: the area is not great. The noise from the street is not from bars or restaurants, like much of the zone, but by people going to nearby Rue St. Denis (prostitution) and stores opening and closing, getting deliveries etc. The street is busy. The heavy front door slams at all times of the night. The building has paper thin walls and the Chinese neighbors next to the apartment are noisy - their cat was lost - to the point that within the building people complained. The apartment door has an electric key system which works fine... when the batteries are charged. If not prepare to wait for an hour.
Check in time is 4pm and not a minute earlier and leaving luggage at the central office is a 30-minute walk or drive, depending on Paris traffic. But very, very central and nice to walk around.