Thank you so much for the feedback, peeps! Really appreciate it!
Will keep your tips and advice in mind during my planning.
Definitely will be looking into separating the wet and dry areas in the bathroom, which will be quite a headache because it looks so tiny! But hopefully able to figure something out.
Adding a mirror to that bomb shelter facade is a great idea! And that small space between the living room wall and shelter wall, will need to utilise that in a smart way.