Moving baby from cot to bed

Hi ladies

I need some advice. My daughter seems to sleep much better if she is left on a bed as apposed to sleeping in her cot. She will not sleep in her cot at all in the day, but relaxes straight away and take nice long naps if I leave her on our bed .

What is a safe age to move her to a bed?
My daughter is very young, and I am getting loads of people telling me I am crazy to even consider this. But I really do think this is what she wants.

Any advice?