It's about half an hour from the train station, so the times you indicate should be perfect. If you want to stay longer, there's small hotel just around the corner at 75 eur/night. I'll give you the details if you need them.

In the long run, we're all dead. John Maynard Keynes

LEP found this website:  Last Minute Hotel Deals - Rates To Go

My friend recommended the Houses - Paris: 90 euros/night (two night minimum).  You need to email them (resa@thehouses-paris.com) to reserve.  My friend's comments:

It's a simple, small, cute apartment with a kitchenette, about 30 meters squ., great, generous-sized shower (none of that tiny plastic shell stuff.)

It is located in a ruelle/through-alley which is one of the secret gems of paris. It is really, really special. My Parisian friends were delighted and impressed, as the neighborhood has been until recently, traditionally immigrant and working class. There were so many Parisian 'tourists' making urban pilgrimages here to 'discover the countryside' in paris, even people leaving contact names on the building doors asking people to contact them if they wanted to sell.

The problem is, it's about an 8 minute walk in any direction to one of 2 or 3 metro stops. No problem if you don't mind walking.

Also, Homelidays (though a quick search indicates that most [if not all] offerings are by the week, rather than the night.)

Anyone know of any other such possibilities?

Truth unfolds in time through a communal process.

Thanks Nanne, but almost 10 hours for a trip that now can be done in 31/2 hours, including 3 hours waiting to change the train in the middle of the in an empty train station in Germany is not my idea of having fun. I must be getting old. :-)

I don't know why there are no direct trains at night to Switzerland, all night trains include changing in Karlsruhe.