It's really sweet of you to invite us.

[Mr Francis]

Just another question, please. Are the following sentences both correct?

a. It's really sweet of you to invite us.
b. It's really KIND of you to invite us.

Thanks a lot. Take care.
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You can get it if you really want.

[Beeesneees]

Yes, they are. 'Sweet' is a term which doesn't tend to be used so often, and it would certainly sound odd in a business or formal context.
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Cheers m' dears!

[Mr Francis]

Thanks a lot, Beeesneees.

You have been very kind :-)
_________________
You can get it if you really want.