I booked the hotel on the arrival day at France.
The easiest and cheapest way to the hotel from CDG is taking RER B trains to Bagneux and using buses no.197 (to Porte d'Orleans).
You can also reach the hotel from Porte d'Orleans on Metro 4 by bus no.197.
The nearest bus stop is Croix d'arcueil, that is located in front of the hotel.
The hotel itself is normal; the price is reasonable, wifi is available, rooms look clean.
I used a buffet-style restaurant in the hotel, which is also normal but the price is a little expensive.