We stayed at the Trianon for 5 days and we all loved it for several reasons: Located in the Oise valley, gorgeous and romantic. The house is calm with a big garden. The breakfast is delicious with "real" croissants :) . The train station is close by and you are in Paris in 1 hour+.
The village of Auvers is adorable with very good restaurants. It is close by Roissy airport (30 min). It was a very convenient spot to rent for a family wedding who took place in Mery, 10 min from the house, and it is much better setting than hotel
I did not meet the owner who was out of town, however we appreciated his flexibility.
The house has an artsy flavor, full of bookshelves, fun to hang out. Expect to stay in a country home not exactly spotless, but I prefer this place to any hotel in the Paris area.