A few thoughts: Much more moody than it is actively scary, this is one of those classic horror movies that's insanely easy to get your hands on (pretty much every public domain horror collection features it), flies by at just over 70 minutes, and is well done enough for it to be hard for someone to not find the time to give it a whirl. I love the organ music, a distinctively shrill and atmospheric score that's every bit as understated as it is creepy. Very much a product of the '60s, the setting, dialogue, characters, and costumes all add to the experience in a way that's much more interesting to watch now than it would have been when it came out. There are some fantastic moments and scenes, particularly ones with the ghoulish pale dark-eyed man, but thereally is much more to it than that. The main character is an isolated loner, very unlike most horror leads of the time, and in spite of the actresses stilted performance, the character still stands out. It's a simple movie with a very stripped-down story and execution, but it works really well.
Who would I recommend it to? Anyone who enjoys older, moody horror movies. Maybe not quite all-time great status, but this is one I always enjoy revisiting and is well worth the time.