I have a large CRT that looks pretty good but honestly still pretty fuzzy, its been years since I tried that tho so I don't know if it would be a lot better than what I have now. Then I used a really small old ass flat screen for a while that honestly looked really good, I think just because it was so small it had to look pretty sharp. It stopped working tho :(

I have the n64 in my kitchen and use a thrift store flat screen TV I just got as both a second monitor and n64 TV. Its pretty old and has a hell of a lot of different inputs. Unfortunately the n64 looked like total shit on it... BUT I just got a s-video cable hoping it would make it a bit more bearable and at least on this TV its a huge improvement! It really fixed the image quite a bit, there's still a bit of checkerboarding with the pixels of different colours sort of hashing together instead of blurring together as they would on CRT. But its way more playable. I should try the s-video cable with the CRT sometime just for fun, but I think the reason why its such a huge improvement is mostly because the TV interpreted the composite image terribly.

All that to say, its still fuzzy as fuck, because its an n64 lol.