Ruben's place was one squeaky pullout from perfect... but I'll get to that.
THE PROS- Ruben's apartment was very clean, well furnished and stocked with the necessities. Nice little kitchen, plenty of towels and a great shower even for a 6'2" guy (you'd be surprised how many short showers are out in the world). The location was ground floor, easy to access and very secure, in a nice neighborhood with nearby restaurants, a store where we got some breakfast foods and a conveniently located metro stop just a few blocks away. One thing to note is that there were many similar addresses in other Paris neighborhoods and Apple Maps got very confused and took us to two wrong locations before we found the apartment, so make sure the station your app sends you to is NATION; look for the restaurant La Canon de la Nation and that's your street.
Ruben was a great communicator and left us tips on his favorite local restaurants and services; we followed his recommendations and were very pleased.
THE CON (and there was only one- the squeaky pullout bed that you'll read about in every review. It's a nifty bit of engineering- just pull the handle at the top center of the sofa back (not under the seat as with most) and the sofa does a Transformer act into a bed. So far, so good, and then you sit on it and it squeaks SO LOUDLY... and then your travel companion also sits and it squeaks SO LOUDLY... and then you quietly wiggle and it squeaks, and you lay down and it squeaks, and you take a deep breath and it squeaks, so you try a shallow breath and it squeaks so the two of you try to synchronize your breathing to offset each other's motions... and it squeaks.
Save time and hassle and just put the mattress on the floor.
All in all, I'd be happy to stay there next time I'm in Paris and be perfectly content sleeping on a mattress on the floor.