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 uplit dungeon windows in the Common Room give all 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 divans and comfy window seats have been put up with many pillows in an array of colours, but mostly in green and silver as well as stacks of warm blankets if someone wants to cuddle up on a chilly night. A small magical hot beverage maker that makes tea, hot chocolate and coffee complete with cookies from the house elves and cups is stuck next to the most left window. The beverage maker is a charmed gift from Professor Marchand.

So why not come over here, snuggle up with a blanket around your legs next to one of the windows and look out at the lake and its living eco system and you might if you're lucky see a merpeople swim by or the giant squid comes and taps at the windows.