as hot as 160 degrees. Thats close to temperatures recorded on some spots on our own planet. It doesnt mean its that hot all over the place (and its a much bigger world than ours). You can easily expect to find regions that have temperate or tropical temperatures.
rotation speed is not the same as centripetal speed. Aka, the outer ring of an old vynil disc spins faster than the center ring yet both cover the same distance in the same time. Rotation speed is not an issue.
water is almost guaranteed to exist in liquid form under that combination of temperature/mass. Of course thats if the planet followed something similar to earth's geologic processes and is not a sea of molten lava.
Gravity can be an issue but thats applicable if/when we can send someone there. by the time who knows what tech will exist to counteract that.
If there's water there will be life. Guaranteed. If life sprung up to use that water that is. Would it be worth sending a probe? Hell yes. 20 light years means our fastest ship would not be able to reach it in 200+ years time..and the first signal would take 20 years to get to us after that. If anything they should be scrambling to send that probe this decade. By 2200+ chances are we'll have much better propulsion to send people out there and the probe could very well be sending them a signal telling them 'hey there really IS water here! (or not)" and save them a more costly, dangerous trip.
One light year is 186,000 X 60 X 60 X 24 X 365 miles.
That's a total of 5,865,696,000,000 miles traveled in one year at the speed of light in the vacuum of space..
The fastest space probe that man has built is currently Voyager 1 which is traveling at 38,600 mph (light travels at 180,000 miles per second, just to put things into perspective)..
I don't think I need to do any more math to show you that there's no way anything man-made can make it 20 light years in anything close to 200 years..
I'll say it's in the ball park of 150,000 to 200,000 years to get there while traveling 38,600 mph..
The distances are so vast and time to get there so great that any probe sent now would be long dead by the time it reached even the same general area(with regards to the vastness of space)..
Personally, I don't think Earth(as we know it) will make it far enough into the future to develop something that will travel even 1/100 the speed of light..