A very unusual place - you get a house, no less, in the very center of Paris, 3min walk to Montparnasse. There is a lot of flexibility if you travel as a family, the place has several room upstairs and a large well equipped kitchen and a living room downstairs. It is not cheap, but if you are 4 or more it's definitely worth considering: for a price of two good hotel rooms you get a lot more flexible arrangement. Communication with the host was easy, responses always came fast.