Is being sweet a good thing?

Depends on the situation

It is but don't over do it as it can creep people out, especially a romantic interest.

Examples:
Guy gets tattoo of girl's first name on first date.
Girl texts friend love emojis hours a day, everyday, and friend doesn't share the same feelings as her.
Guy gives girl over 30 stuffed animals on an outing at the county fair.
Lover dresses up in a dog costume, barking and acting like one to impress the other lover and they don't know each other that well.

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Whenever someone uses the word "sweet" regarding another person, what they are really saying is:

"You're not a bad person, but I wouldn't be caught dead with you in a social setting outside of the context we already know each other."

People, maybe, but it may mean you're a big pushover who primarily people-pleases.

Food, can be good but too much sweet is very bad. Savory, spicy, and salty, on the other hand, are things I couldn't do without.

Rooms, well if you can get a suite for the same price, why not?