at last! something I know about..I've had the enormous pleasure of owning a greyhound and two whippets, unfortunately only have one whippet left now.
Whippets are simply awesome. Clean, quiet, loving ..they like a sleep on your bed, or couch, love their own bed too. They are timid, sure, however so long as you give them a chance to "grow into the family" they make the best mates..
I've never had a puppy, both the whippets were older ex show girls (NZ and AUS champions) and the greyhound was a not so good ex racer..but made a perfect pet..best and fastest gundog I ever had!
One whippet loved the car, the other wasn't so keen, but would grin and bear it.
They don't have any "breed specific defects" and you can take them anywhere with trust..(not too sure if you would let one off in a cattery though ..just saying)
They don't like being growled at..great sulkers, but they are very rarely naughty unless they are bored, and you might find some of your clothes or shoes in their beds..they prefer company most of the time, if it isn't human perhaps get two of them if you are going to leave them at home alone for the work day..
a 10 minute or so walk in the morning or evening is about it for exercise, they may have a ping round dinner time, have the best body clock of any dog I know..they aren't real endurance long distance dogs but will play and sleep the day away. Keep them on the lead out of the property..zero road sense..