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In class we had some sentences with intentional mistakes to fix. One of them
was "きれいそうなsomething". The mistake was that you don't say that because if
you're looking at something, you can tell if it's きれい, so you wouldn't say it
"seems" きれい. Is it really something people would never say?
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question
grammar
Is きれいそう a mistake?
When you are directly seeing some beautiful thing in front of you, you cannot
say something like きれいそうな絵ですね. Saying ～そう always involves a speaker's
guess/speculation, so if you already know that it's beautiful or not, you
cannot use this expression.

An analogous case is おいしそう ("Looks yummy"). You can say this before eating
something, but saying おいしそう after actually eating it will sound very strange.
(Because it no longer _appears_ to be yummy but in fact is yummy or not).

For this very reason, as @Chocolate mentioned, in situations where you are not
directly seeing something, saying きれいそう is perfectly fine. When you have heard
how beautiful something is, you can safely say きれいそうですね ("Sounds beautiful.")
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A Japanese language teacher said 様態のそう(な) can't be used in the case of
見たらわかること(You can understand when you see them). For example, あそこにきれいそうな人がいる
and 彼女はきれいそうだ would be unnatural because you can understand whether she is
beautiful or not when you are looking her.

However, as the comments, 夜景のきれいそうな町 and 部屋のきれいそうな芸能人 make sense. This きれいそうな
is adjective for 夜景 and 部屋, not 町 and 芸能人. That is "City whose night view seem
to beautiful" and "Entertainer whose room seem to be beautiful". This would be
speaker's guess.

This is a source. <http://nihongomemo.hatenablog.jp/entry/2015/03/27/104605>
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answer