Hello, I am planning to spend a month in Paris sometime in the timeframe of mid-september to mid-december. I will be working during the day (taking a few actual vacation days here and there) but at night and during the weekends I plan to walk around the city and sightsee.

Few questions:

1. I plan to use airbnb for accommodation. Is this a good idea? Are there extended stay hotels worth checking out?

2. I enjoying bike riding for fun, not necessarily to go anywhere in particular. Are there good areas in Paris to do this where locals won't hate me for biking around?

3. Recommendations of what part of the city to live in? I have heard 4th, 5th, 6th and 18th districts are best

4. Anything else I should know for spending a month in Paris?

Thanks