The house was pretty much on par for the type of places he'd been staying in. Around the full moon sometimes he didn't trust himself around a lot of people. Instead Oz would find an abandoned house or barn and stay there until the three days were over.
They were usually damp and full of dust and mold but it was better than temptation he wasn't sure he could resist. He hadn't actually changed without wanting too since he'd attacked Tara back in Sunnydale but sometimes he could feel the need to rip and tear riding him. Sometimes they were haunted with more than dust and mildew. Spirits were trapped in some, for the most part they were sad things that he wouldn't have known existed if it wasn't for the wolf senses telling him they were there. Sometimes they were angry and resented him staying there.
This house had the most active one he'd encountered yet. The aura of hate hit him a good ten feet our from the house and he had to force himself inside. There was a dead body under the floorboards, and skeletons with their parts scattered around the rooms. The ghost had been busy, and efficient, in keeping people out of it's home. If you didn't leave, you died.
Oz pried up the floorboard and set fire to the body underneath. He didn't bother to try and keep the blaze under control after that. He just let it spread however it wanted to and left the house behind.
Sleeping under a bush was going to be more comfortable than that place.