Do you plan to visit Paris for a week or so? Have you discussed where you will stay once you arrive? In most areas choosing an apartment is hard, yet in Paris, you have access.
First when choosing an apartment you need to look at the neighborhood you plan to be in along with your budget. Are you going to stay one night or several months?
There are many apartments available in various areas around Paris. The rates depend on the number of people that is going to stay there and how long you will be staying. If you are traveling alone, why not choose a Bed & Breakfast? A comfy apartment or bed and breakfast would be nice to have giving you your freedom, romance, and your own private view.
The sites and tours are always going on