In your sentence, use "unfamiliar." "Unfamiliar" is always neutral and emotion-free. "Strange" has a range of meanings but usually carries a slight negative connotation--surprising, bizarre, slightly wrong, slightly "off," slightly eerie, slightly creepy. It means you are UNCOMFORTABLE. If I were to say "this chicken salad tastes strange," a likely reply would be "let me smell it, maybe we should throw it out." If I were to say "my computer is acting strangely," a like reply would be "better run a virus scan." If I say "I am a stranger in this city," that's a neutral statement of fact, and someone who lives there might say "Can I help you find your way?" If I say "this city is strange," the answer from a native might be a defensive "Strange? STRANGE? In what way?"

Unfamiliar means something you are not familiar with. This could be used for anywhere you haven't been before, or somewhere you don't feel familiar/comfortable. Strange can be used to describe a place you are familiar with, but feel is unusual or odd in some way. It can also be used to describe people or objects. E.g. I am very familiar with my school. It's a very strange place because everything is upside down.

I recommend "unfamiliar". You can say also "strange" in a synonymous way to "unfamiliar" but sometimes "strange" means "weird" . If you choose "unfamiliar", you will avoid this ambiguity.