Wow, it's just like an old Schwinn Breeze! It even has a repica of they chainring. I don't understand why it is listed as a "21-speed"; the picture shows only one chainring.
Personally, I would buy an old Chicago-built Schwinn, available for under $100 on Craigslist, or for $20 at a garage sale, and add a new rear derailer. Or if you can get away with only 3 speeds, the Sturmey-Archer hubs are nice for city riding, in flat to slightly hilly areas.
I would not recommend buying this bike new, however, unless you cannot find a good used bike. The new Schwinns are made in China with non-brand components, and are not known for durability, unlike the old Schwinns pre-1985.