Where do you find him?

where,强调句，强调句的回答强调所问的内容，如此句：
It is in the hotel where he stayed（that I find him）.
此句中“where he stayed”是定语从句；
【区别强调句】：
将句中的“it”“that”去掉看句子是否还成立，若成立则是强调句，否则不是强调句，如：
It was 7 o'clock when he got up（不是强调句）
It was at 7 o'clock that he got up（是强调句）
以上是我个人愚见，希望对你有用

where吧

that/where
强调句型的结构:It's +被强调成分 +that +其他

祝你进步!

填that/which
因为前面有in了。
如果是 It is the hotel where/in which he stayed.

我语法一般。。。不是特别确定啊

where 的话是一个宾语从句
强调旅馆