In many ways, if you discount the size, Frisk's room is probably what most people would consider normal. But it strikes Yuri as shabby, especially in comparison to his own carefully maintained home, and the obviously childish decor such as the posters and blanket... It makes certain, hard to identify feelings stir within him.

At any rate, he doesn't recognize the neighborhood or at least what he can see of it.

He flops back onto the pillow the instant Frisk stirs. He still doesn't want them to realize what he is, and he waits a few beats until they've left before sitting up again.

The quiet just sets him on edge, and Yuri's very careful to move slowly to his feet- walking on a giant mattress feels incredibly peculiar- and pad around the bed, gauging how easy or difficult it would be to climb down at any point. He also gives the griffon thing on the desk a brief stare; something about his current size makes it look a lot more real to him than it should.