I think the most important thing about villain POVs is that you need to get his motivation right. If your villain is just a monster, it can make people uncomfortable, because they can't really connect to the POV. So for the "standard villain" I would try to go with the "done the wrong things for the right reasons" approach.
Give him a detailed character, make him care about other people, or even feel sad that he has to do the things he has to do. One great example - especially for the crime/thriller genre - would be Psycho Pass Season 1. There you have a great example for a villain, a lot of people really liked. Fleshed-out character, his own flaws and moral code, and his ideas mirror a hero's one in another story. There was just that one tiny detail, that makes him stand on the wrong side of the law...
That said, it's really hard to give universal advice on such topics. I would argue, that depending on your story a serial killer's POV should make people feel uncomfortable. Nobody looks at the news, sees the story about a serial killer/rapist/etc and says "Hey, his story sounds interesting.". So if you mirror real life so that it's for his personal satisfaction, a killer shouldn't be lovable (imho).
You can make the villain lovable, is he is "a hero in disguise". If he also fights for a noble goal, but he decided to kill for it instead of studying law for 10 years. You can also make him more likable, if his motivation is less about him. An easy example would be the father, who tries to kill the people, who harmed/raped/killed his daughter. If you have a crime/thriller story, those things can make for an interesting twist, where the readers have to decide whether that loving father deserves self justice.
The biggest problem with that is, that this only works for a limited variation of character motivations. The bad CEO who kills the miners for profit? Nope. The serial killer who wants to have fun with girls who looks like his younger mother? Nope. Whenever self-interest is the driving force of your villain, it won't work. At least, after you openly disclose his motivation (It might work, if it seems like he is doing it for others before readers later learn, it was always just for pleasure).
But it works for the commander of the enemy army, who also just wants to protect his family. For the thief, who just wanted to protect his life/his sister/whatever and just drowned in that world of crimes. For someone, who does crimes for justice. And so on and so forth.
It often also works for villains with detailed backstories, because readers are just so happy to get these, that they will love them just for that. It sounds a bit sarcastic, but a well-written villain is sometime all it needs to get readers to appreciate him. They might not love to hate him, but they will at least love to read more about him.
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If I would try to say this on a higher level: The clash of protagonist and villain is the clash between their movitations and worldviews. And their difference in worldviews leads the villain to use methods the protagonist doesn't agree with. So if you want a villain people love, make his worldview and motivation as relatable as the hero's. If you can achieve that, people will at least show understanding and in the best case might also want to know more about him/cheer for him/etc. Make your villain the hero of his own story who just so happens to disagree with your protagonist on maybe just a small detail like "How should we use our power?".
That said: There are motivations and worldviews, that are meant to be horrible and disgusting. Don't try to make those villains lovable. If the worldview of your villain goes against the value spectrum of your readers, don't try to change him into something better. Embrace that he is making people uncomfortable. Embrace, that you can display the flaws of his thinking in a way, that makes people want to shut up.
Of course, depending on your audience, you might have so switch things around, use less villain POV, make him a bit likable before he "becomes" the villain, etc. But don't try and make an "evil villain" likable. That's just wasting a (possible) good character.