We have a WC. Do you? This little half bath is right off our kitchen and is probably the tiniest bathroom /laundry room ever. It has a corner sink & corner toilet. But I love small spaces. Do you? Tap for sources.
Instead of a glass door on the shower you could have another door like the laundry side so you would be able to have it in the open of the studio appartment but no one would be able to tell it is a shower (no need for wasted area to have a bathroom | Compact Laundry / Shower Cabin Combo for Small Spaces by Vismaravetro