What a fun place. The apartment appears to be converted from a courtyard workspace (along with two others) and is novel in its design. It uses every space efficiently and has, above all, a very usable/workable kitchen (which is a big plus for those of us who prefer to stay in at times and cook). It also has luxury-hotel quality soaps and bath sheets - far better than most.
Though Rue Charlot is close to Republique and two minutes' walk from the busy Rue Bretagne (where you can find anything and everything from cafes, to boulangeries, to delis and city supermarkets) it was 100% quiet. The only sounds I heard were the morning Paris tradition of recycling the wine bottles.
In short: nice everything.