I would strongly recommend to use soft meadow or orchard hay for your kitchen; what guinea pigs like best is to frolic, bury and sleep in the hay. The problem with that kitchen corner is that a) that hay rack is too small considering hay is providing 80% of that daily food intake and that b) you have the wood shavings all over the place in no time flat and that they are not as comfortable to lie and sleep in because the rim in that picture is far too low.
If you have boars, wood shavings tend to get stuck and can injure penises and perineal sacs during scent marking. Wood shavings can also get a lot more easily tangled in long-haired piggies' hairs forming mats than hay.
Have a look at the hay lofts and similar solutions in our members gallery for inspiration:
Member Gallery: C&C cages/homemade cages
I use easy to clean seed trays for my own hay corners.