Fantastic place to stay for families!
We were 6 people - 4 adults with 2 children and the place was perfect for us. We were coming from London via the Eurostar (Gard Du Nord) and the place is literally a 10-15 mins train ride away on the RER B line. Couldn't have been easier. The location is ideal if you have little ones as the Jardin Du Luxembourg has playgrounds, sand pits, a little boating pond and even a puppet theatre. We were close to supermarkets, good restaurants (esp around Montparnasse) and very walkable to the Latin Quarter & Saint-Germaine.
Pictures are representative of the place and everything was very new and clean. Bedrooms were a good size and the kitchen was well equipped (crockery, teas/ coffees, cooking utensils, cleaning supplies etc). If you do choose to stay in for an evening, the large projector / screen was amazing!
Perhaps the only thing I did not realise beforehand is that the townhouse is situated in the middle of a living compound with taller buildings around which means you're not really getting any views of the streets of Paris; however, there's still plenty of light. The plus side of this is that the place is extremely quiet and felt very safe for us traveling with young children.
Finally, it would be an injustice not to mention Patricia. Patricia (who works with Etyan) was our host during our stay. She is quick to reply, easy to communicate with, really friendly and extremely responsive when we had minor issues with the heating on arrival. The little treats she left us was a bonus :)