Qualitative vs Quantitive

In my questionnaire I have chose to use both quantitative and qualitative questions because although most people wont want to spend ages answering questions in detail with opinions it does help us when we look back over what people have written to ensure that what they really like in a music video will be included in ours, and we wont be able to get detailed information from only asking quantitative questions.
I have however put a few quantitative questions in at the beginning on the age question for example because people may not like writing down their actual age so this way its not being to precise. I also feel that it wont scare people away from answering the questionnaire when they see loads of really long questions with massive spaces underneath each one all the way down, so this way it breaks it up slightly I think.