It's a saying that means it will fulfill your need. :)

People sometimes say, "I fancy that". This means they want it. For example, if a man sees a nice car, he might say "I fancy one of those". This means he would like a car just like the one he sees. When people say, "that suits my fancy", they mean that what they see matches with what they want. If a woman sees a beautiful diamond ring in a shop window, she might point to it and tell her husband, "that one suits my fancy". He then knows that ring is the one she desires. Hope this helps

Something you'll really like or something you'll really enjoy

It means you’ll like it. “Your fancy” is basically an idiom for your preferences. So, if it suits your fancy then it will be something that matches your preferences, or your likes and dislikes.