I'll share my experience which was a little bit frustrating. I asked to leave the luggage earlier than the check-in time, which was at 14:00, and I could talk with the previous guest and therefore check the place. Anais informed that someone would do the cleaning and that the place would be ready at 16:00 - the check out was at 10:00 of the next day.
When I get back to the apartment, I could see that it wasn't well cleaned and that the sheets of the previous guest haven't been changed.
Besides, it was very hard to select a good temperature on the shower and while I was taking a bath, the water suddently became very cold and I couldn't finish my shower ( I was taking a shower for no more than 10 minutes, including the time to select a good temperature). When I asked him if there was anything I could do in order to have warm water again, and to check if that was normal, he just said that I probably have used the whole hot water and that there wasn't anything that he could do.
I also had to leave EUR 20,00 for the cleaning.
The studio is very small, so if you intend to stay more than 2 days, I don't recommend it.
The location, however, is great, with lots of restaurants and supermarkets nearby and in just a few walks you get to several touristic spots of Paris.