The last 2 times I went to Paris I in the Rue Cler area recommended in RS guides. Loved the area (as you can guess by the fact I went back to the same area.) First time we stayed in a hotel and second an Airbnb apartment. I've decided I'm sticking with hotels outside the US. The random small bits of help, advice, etc. (like printing my boarding pass) you get from the hotel staff are what I want. Also making the meeting with the Airbnb manager on a time schedule and when you don't have cell phone capability is too much a hassle. I got an Airbnb with the idea we would save some money by eating in the apartment, but after all worrying about bringing the food in, cleaning the kitchen and all is not what I want to do on vacation--especially in Paris.
Rue Cler is a charming market street and a real neighborhood for Parisians not just tourists. It's busy/lively but not overcrowded. There is a small Carrefour grocery, others shops 3 bakeries, cafes, restaurants, bancomat, Metro entrance, and major bus routes all right there. It is quite close to the Eiffel Tour (make sure to book that ahead).
The best way to get around Paris is to walk. The city is beyond compare. I like buses for longer journeys as I like to see the city. Of course, the metro goes everywhere. Just grab your RS guide and pick the kind of neighborhood you prefer from his suggestions. Though Rue Cler will always be my 'home' in Paris.