Adrien's flat has a truly fab location - 2 blocks away from Arc de Triomphe and a 20-minute (slow) walk to the Eiffel Tower, the top of which can be seen from the windows of the flat. We stayed with my 2-year-old and his grandparents, and the flat was pretty good for a toddler too: plenty of space to run around, a spacious bathroom with lots of shelves, and the two bedrooms were surprisingly spacious too.
We did have three minor issues, though: 1) Unlike in the photos, the flat doesn't actually have a dining table. It was quite hard to give dinner to a toddler balancing on a bar stool or on a fiddly & rather uncomfy rattan chair. 2) The building does have a lift (elevator), but it certainly is the smallest lift I've ever seen! Bearable to two slim adults or one larger one. ;) We four had to use it in three goes (mother + toddler; grandmother + luggage; grandfather + buggy). We had the smallest folding buggy in the market (Babyzen Yoyo), but even that didn't fit in the lift unfolded. 3) How can there be Paris apartment without a set of wine glasses?!?
Apart from that, Adrien's flat was lovely and very comfortable, and I would happily stay there again. :)