The phrase "a lovely atmosphere" is correct and can be used in written English. You can use it to describe a pleasant, calming environment or atmosphere. For example, "The restaurant had a lovely atmosphere, making it the perfect spot for a romantic dinner."
It's a lovely atmosphere.
A lovely atmosphere, a few surprises, some compelling contests.
Every customer receives a warm welcome on entering the shop; it has such a lovely atmosphere.
So everything's grand and there's a lovely atmosphere in the house.
There was a lovely atmosphere around them, which was another great thing about the school.
It has a lovely atmosphere, and it's a good place to talk to strangers (even ladies, since 1970!) and forget the Internet.
This hotel has a really lovely atmosphere with an incredible entrance demonstrating sheer opulence.
"It's a really lovely atmosphere and I'm really happy.
"My fiancé's sister lives in Bristol and she said it was a really lovely atmosphere and it's awesome," she said.
Although very pretty restaurants, they do not have exactly what I am looking for: a romantic room with a good wine list, lovely atmosphere and a feel that is not too French.
"It's a really, really lovely atmosphere," she said.
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Software Engineer at Adobe, UK