Just got back from Paris 2 days ago! We rented an apartment in the 11th ar. Ran us 389 euros for the week. Most are rented by the week but you could look at vrbo.com or we got ours from craigslist Paris. Metro is great and easy to use. We got "carnets" (bunches) of 10 tickets for 11.10 euro (individually they are 1.50 euro) for travel. Works on bus, metro and trains in Paris.
We took Delta CDG-SLC back. Was very nice but long trip!
If I had just 3 days I'd focus on the Marais, Sacre Coeur and Monmartre (go to the Autour du Moulin cafe on Rue Lepin - great music and food) and the Eiffel Tower and Rue Cler area.
PM me if you want any details.
Have fun!
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