The place I'm going to describe is a small desk in the corner of my bedroom, right next to the window. I'm in my final year of a nursing degree in Manila, and I share a flat with my older sister, so this corner is really the only space that belongs completely to me.
It's nothing special to look at. The desk is a cheap wooden one my uncle made, slightly wobbly on one side, so I've folded a piece of cardboard under the leg. On the wall above it I've stuck a weekly timetable and a few sticky notes with medical terms I keep forgetting. There's a little plant, a reading lamp and a jar of pens, and that's about it. I deliberately keep it tidy, because if there's clutter on the desk I start tidying instead of studying.
I usually sit there early in the morning, from about five until seven, before my sister wakes up and before the jeepneys outside get noisy. I sometimes study there at night as well, but I'm much sharper in the morning.
As for why it helps me concentrate, I think it's mostly about habit. Because I only ever study at that desk, my brain seems to switch into work mode as soon as I sit down. I never eat there or watch videos there. I also leave my phone in the kitchen, which I think makes the biggest difference. And the window helps too. When I get stuck on something difficult, I just look out at the mango tree for a minute, take a breath, and then go back to it with a clearer head.