This place probably reminds her of camp. [It definitely reminds him a little of camp, but he keeps that to himself. There are a couple of things he could say here, but he's going to address them one at a time.]

You'll probably end up with a couple of strangers, yeah. The two girls I ended up housing with were total strangers, but people move out and find other houses all the time. [Frankly he sort of expects Nico to move out and do his own thing, but that doesn't mean Percy won't try to keep an eye on him now that they're both here.] You're hoping to find ghosts?

[It's a thought. Nico spends more time talking to the dead than the living anyway.]