I've been using ko-fi for a while so your idea of using it as a tip jar is just fine!
It's interface is very user friendly and easy to navigate plus the site allows you to select whether it displays their buy me a coffee style model or a more donation based layout (all explained in the settings of your page)
It's also got a handful of features like a gallery, shop, commissions and just recently the option to have memberships became available which work similarly to patreon tiers so you can customize each tiers amount and rewards for supporters to choose from
a lot of what's on the site is pretty self explanatory plus there's a bunch of guides provided to users from the site itself on how to better organize and promote your page to make it look good. best of luck!