One of the perks with living in the Hogwarts dungeons is that you get access to your very own under water aquarium and you don't even have to pay a sickle. The dungeon windows in the Common Room give all the snake students a direct view of the Great Lake below the water surface level and it's creatures and plant life.

Under the largest windows are comfy window seats which have many pillows in green and silver stacked on top of them, as well as tons of Slytherin colored warm blankets if someone wants to cuddle up on a chilly night.

A small magical hot beverage maker courtesy of Professor Marchand that makes tea, hot chocolate and coffee complete with cookies from the house elves and cups is stuck next to the most left window.

So why not come over here, snuggle up with a blanket next to one of the windows and look out at the lake. If you're lucky you might see a merperson swim by or perhaps the Giant Squid might grace you with its presence. You never know.