I have had the misfortune of three visits to the K Summer Gardens. And whilst the overall setup is rather pathetic (a couple of plastic containers with stale chocolate danish, leftover crumbles at a spot they claim has seen some lemon cake before, some stale savoury stuff, warm drinks, plastic cutlery, all in a state of mess and not looked after) the chairs were actually fine. Surely not for 3 hours, but OK for 20 or 30 minutes. Sure, it'd be even better with a seat cushion, but they're ok.