
Slytherin:
The Slytherin common room is found in the dungeons of Hogwarts Castle, and is located underneath the Black Lake. Because of its location, the light in the common room is green. Harry Potter along with Ron Weasley entered the common room in his second year to find out if Draco Malfoy was the one opening the Chamber of Secrets.
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Gryffindor:
The Gryffindor Common Room is located in one of the castle's towers (Gryffindor Tower), the entrance to which is located on the seventh floor and is guarded by an oil painting of the Fat Lady, who is garbed in a pink silk dress. She permits entry only after being given the correct (regularly changing) password. Behind her is a large common room, with a fireplace, and two staircases leading up to the girls' and boys' dormitories. There is a spell on the girls' staircase that prevents boys from using it, however there is no such enchantment on the staircase to the boys'dormitory, allowing girls to use it whenever they wish. The common room is very comfortable, and members of the Gryffindor house meet there for study groups, celebrations, or relaxation. The walls are lined with portraits, each one depicting a previous or current Head of Gryffindor.
Common Room Information

Hufflepuff:
The Hufflepuff Dormitories and Common room have never been seen by outsiders and is the only house with repelling devices in case of intruders. They are accessed through a pile of large barrels, found stacked in a shadowy stone recess on a right-hand side corridor near the kitchens. The barrel two from the bottom, middle of the second row, will open if tapped in the rhythm of 'Helga Hufflepuff'. As a security device to repel non-Hufflepuffs, tapping on the wrong barrel, or tapping the incorrect number of times, results in one of the other lids bursting off and drenching the imposter in vinegar.
However, once you make it through the tunnel entryway, the Hufflepuff dormitory is a quite cosy and welcoming place; it always feels sunny. The common room is a large, earthy, round room with low ceilings. The view from the round windows is of dandelions and rippling grass.
The decor emphasises the earthy-feel of the room with plants hanging and resting all about the room, some that even sing and dance. Burnished copper touchings with plush, cosy yellow and black patterned sofas and chairs welcoming a Hufflepuff student to relax and discuss the interesting specimens brought in by the Head of House, Professor Sprout. A Hufflepuff student retires through big, round doors in the walls of the common room to their dormitory.

Ravenclaw:
The Ravenclaw common room is in one of the castle's towers and is wide and circular. You have to climb a tight spiral staircase to get there. It has graceful arched windows, and the walls are hung with blue and bronze silks. The domed ceiling is painted with stars, which are echoed in the midnight-blue carpet. Tables, chairs, and bookcases cover the expanse of the floor, and a white-marble statue of Rowena Ravenclaw sits next to the door that leads to the dormitories above. Harry Potter entered the common room in 1998 while searching for clues to the location of one of Voldemort's Horcruxes.
Ravenclaw's symbol unlike the other common rooms in the school, a logical riddle given by a bronze eagle-shaped knocker must be answered to enter.[4] This could prove troublesome as anyone with enough intellect could intrude into the dormitory, as is shown in Harry Potter and the Deathly Hallows where Professor McGonagall had no trouble entering by answering the riddle correctly (though she was a "hat stall" between Gryffindor and Ravenclaw). However, Hermione stated in her first year when figuring out the complicated riddle, beneath the trapdoor, that most wizards and witches do not have much sense of logic, which might be something that Ravenclaw noticed herself and decided to use clever riddles instead of passwords.

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