To start off, the location is perfect at less than 5mins from the Michel-Ange Auteille metro station. Lots of eating options around too.
The hotel itself is nice but I must caution that the room I was in is a bit small. That however was not an issue for me, especially for such a short stay. There is not much space though for hanging your clothes in the built in wardrobe which is very narrow. Based on reviews of Paris hotels, they do all typically tend to be small so Hotel Poussin is at par it would seem.
The staff were super friendly and helpful.
Just note though that the automatic doors get deactivated after midnight, but the gentleman is there to open when you ring the doorbell.
I did not try the breakfast so cannot comment on that.
They ask you to put a refundable of EUR20 to get the key for a room safe. It is a very tiny safe and not laptop compatible at all.
All in all, I had a wonderful stay and would definitely recommend to friends and stay there again without hesitation.