YOU SAID:

there was a crazy person in the apartment next to me.

INTO JAPANESE

私の隣のアパートにおかしな人がいました。

BACK INTO ENGLISH

There was a strange person in the apartment next to me.

INTO JAPANESE

アパートの隣に変な人がいました。

BACK INTO ENGLISH

There was a strange person next to my apartment.

INTO JAPANESE

私のアパートの隣に変な人がいました。

BACK INTO ENGLISH

There was a strange person next to my apartment.