I went to sharfman’s (many eons ago) and have friends that are still involved. 20+ years ago sharfman’s was exactly what you are looking for. Now it has a much more modern (almost OTD) crowd from what I’ve heard (and seen- we met some of the girls recently). That being said the teachers and staff are AMAZING and it is a great place to grow as a person and as a yid.
There is alot less freedom there now then there used to be, curfew, sign-outs, madrichot, etc and they also serve meals these days. If you want more info, find someone who has been recently (like last 5 years) and speak to them.
Hatzlacha!