Choose a style that suits your commute. Sure, you want something sleek. Your bike should also be comfortable and reliable.
Decide how much you can spend. Look for quality but don’t break your budget. Prices can range. Think of your purchase as a long-term investment.
Compare the stock at different bike shops. Don't be shy! Ask the salespeople about the brands. Find out how long the batteries last, and how long they take to charge. Also ask how much replacements cost, and how often--if ever--they need to be changed.
Test ride the bikes you like. Check the handbrakes and the ease with which it shifts. See how it handles turns. Imagine sitting on it for long commutes. The seat should be comfortable.
Make sure the bike fits your body. When you stand, there should be 3-6 inches between your crotch and the frame.
Before you buy a bike, check online for the best prices.
Choose the bike that suits your needs and enjoy the ride!