Look for the prices before You order in a restaurant or a pub or somewhere else, because some place works with "free" prices. It means the price depends on the nationality of the guest. The foreign tourists sometimes get extreme bills!
Things probably change a lot here during summer, but Siofok seemed to me a very quiet and peaceful city. Walking around seemed very safe.
On Sunday we came back from the city center to Adler Hotel (45 minutes walking) late at night. In spite of the complete darkness surrounding us, which was a little scary, I felt safe there.
I am sorry if this page is depressing, but I generally loved Hungary, perhaps it was the weather, or going from the beauty of Tihany to the modern and charmless Siofok, but every trip has it's low spot. This was mine, and I apologize. I hope someone builds a more positive site to show me what I missed. The picture is from Fertud.