This apartment is well-located close to Place Leon Blum with easy access to buses and metros. It's not a bad walk from Notre Dame and the Louvre, though it's definitely faster on public transport. With a 10-pack of transit tickets, it's easy to get wherever you want to go in Paris.
We stayed here in July and it was HOT. We had to choose between keeping the windows open, which was loud all night long but let in some air, or closing them, which made it quiet but stifling. Without any fans, it was a tough choice.
The apartment has a washer and dishwasher, but no soap for either one, so be sure to bring or buy some if you want to use them. The beds comfortably accommodate four adults and the kitchen is spacious and well-stocked with dishes (though not with any cooking supplies).
We were pleased with this apartment and would stay here again, though probably not in July unless we brought a few fans along.