Ok this is one of the best apartments I’ve stayed in for Paris on AirBnb. The apartment is well located and stocked well for 1-2 people. I wanted to say that the radiators do a great job at heating the place too!
So a few things to note… the noise level is not bad for me. The entire complex sleeps late and rises late so it was not a problem for my hours. There is a small child upstairs but they didn’t cry or scream or anything like that - but you will hear the pitter patter of little feet from time to time :) and it was not a bother for me.
I also want to say the location to supermarket and the metro is perfect, and there is a hair salon and cell phone repair on the same street - I was able to receive goods and services easily by staying in this area. Everyone in the complex was super nice to me as well. The 15eme is not as old but it is real! Good restaurants and locals, and prices are lower on this side so it was a win/win! I am returning for sure!