The Hemnes dresser does not have an open top drawer. We have one in our nursery and love it. It is the perfect height for a changing pad and has enough room on the top for wipe, toys, a lamp and some more. We have a small nursery also and it fits great. I have pictures on my blog if you want to see how we use it.
You must be really tall (or maybe I'm really short) lol! I have the Hemnes dresser in my room in brown and specifically didn't buy the white one for DD's nursery because it was so tall I couldn't imagine having to change a baby on top of it. Now that my daughter's 15 months old and has picked up the habit of standing up on the changing pad in the middle of me taking off her clohtes I'm sooo glad I went with something shorter.
To OP, I know exactly which Hemnes changing table you are talking about because I'm considering getting it myself. I love the entire Hemnes collection and the changing table is about 4 inches shorter than the regular dresser (if I remember correctly). Have you looked at any of the other dressers that Ikea has in the bedroom section?