is two days enough to see Paris sites?

is two days enough to see Notre-Dame Cathedral and the Islands of the Seine River, The Latin Quarter and the Pantheon, The Louvre and the Royal Palace, Champs-Elysées and Arc de Triomphe, Les Invalides and the Eiffel Tower?

Any suggestions on boutique hotels in Paris?

I am traveling to Europe this winter and our first stop is Paris. Does anyone have any good suggestions on some nice small hotels that are not too expensive? I don’t really know which arrondissement is best to stay in for tourist purposes. I have been to Paris but I am traveling with others who have not, and we will be doing as much touristy stuff as possible. I have heard good things about the Latin quarter but would love to hear about hotels that anyone has stayed in.

Thanks!