You should only stay here if you're planning on partying in Paris or you have the ability to sleep through loud club music. The room is directly over a bar that is open every day until 2am.
My sister and I stayed here Thursday to Monday and there was very loud music every night (including Sunday!) and even after the music stopped at 2am, there is noise from people talking and shouting until about 4am. On top of that, they are doing construction work next door so you get woken up around 8am by that. We probably slept 4-5 to each night - and that was with using ear plugs we bought on the second day.
Other things to be aware of - this isn't really an apartment, it's a room. There are some plates but no microwave or way to prepare food. There is also no washing up liquid or tea towels. It is also a bit more worn / tired and rough around the edges than the photos might suggest.
In terms of positives, the location is great - close to Republique and the Marais district. Communication was good - Gary replied very quickly and was helpful. I did complain about the noise and he gave me a partial refund for 2 of the nights. I appreciated that, though still feel a bit ripped off given the terrible noise situation.