It usually requires a jacuzzi in order for a room to make it on this list but the Japanese soaking tub looking out over the terrace makes up for the lack of bubbles. You can see pictures of the room in my Cosmopolitan overview post.
Rates run about $240 during the week and $330 on the weekend, but I have seen them as low as $150. That is about $50 more than a basic room City room, but you get a 110 sq ft terrace, an extra 150 sq ft of space inside and a larger bathroom with separate shower and soaking tub. Robes and slippers are also provided. After a long day of gambling and partying, these things make a big difference.
The Cosmopolitan also has a lot going for it. They have great restaurants like Jaleo, Blue Ribbon Sushi and the Wicked Spoon buffet. It also has quirky things like the Secret Pizza place and the Art-O-Mat machines. The Cosmopolitan is probably even better known for its great nightlife/daylife and bar scene. The center-Strip location next to Aria and the Bellagio is good, too.
The Cosmopolitan does not charge a resort fee, but does charge for Wi-Fi. It is also worth noting that the Cosmopolitan places a $150 per night hold on your credit card for incidental room charges when you check in. That is one of the higher holds in Vegas, but it is also one of the more expensive hotels.
Discounts for the Cosmopolitan are limited, but they usually offer resort packages that give you a food and beverage credit. Tracking purchases with your Identity Card can also earn you comps that you can put towards your room charges.