Re: take advantage of sb on sth
We use it in the plural here in the US.
I hope you find your accomdations suitable.
I just googled "find accomdations" and got 632,000 hits. Although I don't really trust Google on those things, it did reinforce that I wasn't losing my mind. Sometimes I say something each of two ways a few times and neither ends up sounding right.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.