First I love how they don't instantly love each other and they have to grow on each other but after a couple of episodes I relished, "Hey! These two people have a bond!"
All the things they've encounterd, defeated, experienced and met, there has to be some kind of bond!
I know the doctor a bit (alot) older and not human but still there so cute together, plus it's not like the doctor is a beast or anything he's an alien, a time lord!
Rose and the doctor were perfect together but of course, the doctor had to be a doctor!