50 sqrtmtr flat in Prenzlauer Berg can go for like €1,200 a month withou utilities with a 3 month deposit, unfurnished. Some in Kreuzberg can be up to like €900 a month for the same size, if you're lucky.
I know of people that pay €500 a month for a 25 sqrtmtr room
I'm a front-end developer who studied graphic design. A very important part of UX is app flow and navigating users through your interface in a seamless, graceful way.
When I was studying UI/UX something that helped me a lot was reading Google Material guidelines. Even if you're not using a Material UI library (like @angular/material), the guideline thoroughly explains what a good UI/UX should feel like, look like, and work.