Booking.com also lists apartments.
It's been my experience that some owners/ managers list on several platforms. That makes it worth checking to see if there are differences among them and for verifying that the rental is legitimate. It's also interesting to see if the pictures vary.
Having been burned by my first and last Airbnb apartment in Athens in 2014, I will never go through them again. Likewise a VRBO we rented in Bruges in 2012 never revealed anywhere that we were expected to clean the place before we left. We found that out when we arrived. Therefore we will never go through them again, no matter how much they advertize on TV. In both cases the apartments were not as they were pictured or described, had maintenance issues and were dirtier than we expected when we arrived. In neither case were the hosts available for assistance, nor did they have anyone to call for help, but in both cases the hosts had multiple signs and/or pages in notebooks telling us what not to do. So I might check VRBO or Airbnb for additional pictures, but I'd never rent through them.
I have absolutely no experience with any of the Paris rental agencies others have recommended. I do have experience with Booking.com for Rome and Venice, but not for Paris. I find the options for filtering results on their website to be very useful. And the reviews are only from people who have actually stayed in the apartments. Positive or negative, that makes a big difference to me.