Kako means How, in what way. Kakav mens what is it like. Kakav je on?= What is he like. What kind of person is he.
Kakav je to pas. What kind of dog is it.
Kakva je to kuća. What kind of house is this.
Kakvo je to dijete. What is that child like.
Kako si spavala. How did you sleep.
Kako je prošao koncert. How did the concert went.