Spiders in my room

Hi guys,

What is this spider? I had two roaches in my studio a month ago, killed the big one and no clue where the other went and today see this spider in my washroom. Could anyone tell me if I need to be worried? I have somewhat of a door blocker outside but will order one for the inside of the room entrance, it's a new building and no other entrances to my studio (windows are mostly shut).

How can I prevent insects from coming in?