This apartment is located two blocks from the subway that goes to the airport. It was conveniently located to Notre Dame, the entire left bank and the Marais. It was a little loud on the weekend, but we live in a city, so we were not bothered. There is an elevator from the 1st to 2nd floor, but you do need to be able to climb at least 1 flight of stairs.
The managing company was pretty responsive when we contacted them for a leak under the sink. Everything was provided and the equipment we used worked well.
We would definitely stay there again.