Update 10
Welcome to the House, located in Los Angeles, California, the House is one of the earliest maps put into Rainbow Six Siege. We can actually see an earlier version of it in the E3 footage of it shown in 2014.
House went through quite a decent amount of changes but ultimately kept most of its layout and structure. It is also used in situation number 2, Suburban Extraction.
House is comprised of three floors, and for attackers technically a fourth which is the roof. This map is one of if not the smallest in the game and features a small amount of the suburbs including trees and cars to use for cover as the attackers. Outside are raised platforms that can be used for sniping but they are ultimately quite vulnerable and make for easy places for explosives or peakers to get whoever is using them.
As one of the most destroyable buildings in the game outside of perhaps the Favelas, House is dangerous for defenders and attackers alike as people can easily come from a variety of directions. Wall Reinforcements are mostly useful for the bottom level and provide less help on the first and second floors.
Instead defenders most often roam the level, making attackers clear House bit by bit. Characters with long range abilities can really help the attackers hold positions as the much of the level is visible through windows and openings, though closer range operators still have the help of its confined corners and easy to traverse design.
House used to be a common map seen in ranked but at this time it is out of the ranked rotation, and instead it is mostly seen in casual and terrorist hunt modes.