My wife, two year old son and I stayed at Olivier's place; it one word, "PERFECT" for us.
Before we even got to his place he'd already explained how to get there (with multiple courses of actions) and gave us a whole plethora of information about seeing Paris and what it has to offer.
I would like to add a few things that will benefit you from staying here: the Metro Station is right down the street, with it you can seriously go anywhere you'd like to see, no problems; the local restaurants, markets and OMG... The bakery there, are to die for; and lastly, it is a moments walk to the "Big Bus, Paris Pass" place... we bought tickets and without Oliver's place, the convenience of getting there and seeing everything and getting back would not have existed.
LOL, them stairs though! Luckily I am in shape, lift weights and body build. I would advise anyone to carry what you can and leave what you can not handle at the bottom of the stairwell and come right back down to get it. It really is not too bad and you might even enjoy to quick work out and raised heart rate a bit!
Oliver, thank you again and we wish the best for you and your family.
-Jhon