We had a great 5-night stay at the Rue Charlot apartment. It was very much as advertised -- three very comfortable bedrooms, two full bathrooms and one partial bathroom (off one of the front bedrooms -- had sink and shower but no toilet). The bedding and linens were of good quality; beds and pillows were quite comfortable; all rooms had plenty of storage space. The washer/dryer was clean and worked well, and we really appreciated the super-sized clothing rack for laying out any clothes that we did not want to dry in the machine. The kitchen was well stocked -- plenty of dinnerware, glasses, silverware. We made breakfast in the apartment every morning.
The location could not be better -- 1/2 block off of the Rue de Bretagne and within a 2 minute walk of a supermarket, cheese shop, charcuterie shop, bakery/patisserie, open air market, Pierre Hermes (macarons!), Jean Hevin chocolates, etc... We enjoyed being within a few minutes' walk of the really busy parts of the Marais but not smack in the middle of all of the tourist traffic. We had fantastic weather so walked to most places rather than using public transposition. On the two occasions that we did take the Metro, we did not have to walk far to get to the Metro stations.
Our host was quite responsive -- when we had a small plumbing issue, they came quickly to check it out and got it fixed the next day while we were out of the apartment.
Just a couple of things to be aware of:
The master bedroom overlooks the interior courtyard and was quite quiet. The other two bedrooms face onto Rue Charlot. While the windows do a good job of keeping out any street noise (it is not a busy street), there was construction in the building right across the street while we were there. The sound sleepers in our group slept right thru the construction noise, but the lighter sleepers were woken up quite early on a couple of mornings. We were not in the apartment at all during the days, so the construction did not bother us at any time other than early mornings.
The flat is on the 3rd floor, meaning 3 fairly steep flights of stairs with no elevator for carrying your luggage. In addition, there is a fairly large step down from each of the 3 showers and nowhere really to hold on to stabilize yourself when you're getting out of the shower. I would not recommend this apartment for anyone with mobility issues / trouble with balance; it would be very difficult to navigate the stairs and getting into and out of the shower.