Tony,
my website is hosted by Tripod; both the web space and the bandwidth (i.e. the number of people who can download something from a website in a given amount of time) depend on how much you are willing to pay.
Free websites usually allow 25 Mb of space and a rather limited bandwidth, so if you post a new song and all your Synthzone buddies want to download it, your website will be temporarily unavailable. What I did was to start with the basic offer and then upgrade, paying a fee.
I have never had problems with hackers or viruses.
Good luck!