Casper & his family have a lovely apartment in a trendy and funky area of Paris. It is within walking distance of Gare du Nord as well as many historic sites such as Pere Lachaise, but also close to public transport or the Paris free bicycles.
The apartment is very suitable for 3 adults, I stayed with my mum and sister. We enjoyed having breakfast at the bar table in the kitchen and although it was very noisy on the street, with ear plugs we also slept very well.
We did not meet Casper but he courtiously checked in with us via email/phone.
We would recommend this place.