Welcome!!
Don't get the Vilano. Buy something a little better. I assume the rear sprocket is freewheel. Freewheels are more expensive to upgrade to the finer drive sets because you'll be replacing the wheel hubs as well. You'll end spending at least the same amount you bought the Vilano just to upgrade the 7 speed freewheel to 9 speed freehub set.
Get something with 8 or 9 speed freehub cassette to begin with. Having freehub to start will make upgrades a lot easier and cheaper. Even if it's $200 more expensive than the Vilano, it will be worth it.
Tips to have good balance on a 'drop bar' handlebar on road bikes. Make sure the bike size is the right fit for you. The right fit makes a huge difference in control feel. And IMO since you're totally new to road bikes, I strongly recommend you get your first road bike from a LBS (Local bike shop), purchasing directly from the bike shop where the shop staff can assist you in person, can't get any better than that! Don't buy online your first ever road bike. An LBS can get the perfectly fitting size for you and even perform basic bike fitting for free.
Also learn to gain confidence riding a road bike by placing your hands on the brake hoods most of the time initially. Learn how to operate the brakes and shift gear with hands on the brake hoods. DON'T use the other hand positions until you have gained enough confidence and balance with your hands on the brake hoods.
Another advantage of making your first purchase from LBS, the shop staff can further guide you into the basics. They can even allow you to test ride the bike so they can assist in making final tweaks / setup to the bike so you bring the bike home absolutely problem-free.
Expectations:
- A road bike will not make you significantly faster on the flats compared to a MTB.
- Will not significantly make pedaling easier.
- It could be a little faster and easier to pedal on climbs if the bike is at least 10 lbs lighter than your MTB. However I'm only speaking from personal experience as a very lightweight rider with a body weight of only 115 lbs. Someone twice my weight may not even get noticeably faster on a 10 lbs lighter bike. They might think it's a lot easier to pedal (it's going to be mostly placebo effect).
Ironically, what you're wearing while riding and your riding position will make bigger difference in speed and pedaling effort than the type of bike you're riding.