Flame Princess's house is the home built for Flame Princess by Finn in the former Marauder Village. The house itself is made up mostly 2 things: namely, wood and fire, plus a little helmet making it a perfect place for Flame Princess to live. It is the only structure built by Finn himself for a princess, making it special. The location is near the Ice Kingdom as shown when Princess Bubblegum said "Faster!" to Jake, it was revealed on "Burning Low" that the house is being surrounded by mountains nearby 2 rivers, especially the thinner river that has a bridge to cross.
Right after the house was finished, Flame Princess who was very excited went inside to see it for herself and commented "I love it!" with Finn happy as well. In "Ignition Point," it revealed the contents inside of the house, furniture and other possessions of Flame Princess are found.