hole-in-the-wall

US /ˌhoʊl.ɪn.ðəˈwɑːl/
UK /ˌhoʊl.ɪn.ðəˈwɑːl/
"hole-in-the-wall" picture
1.

a small, unpretentious, and often obscure place, such as a restaurant or bar

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We found a great hole-in-the-wall taco place downtown.
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The best coffee is often found in a hole-in-the-wall cafe.
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divejointshackhideawaynook
1.

describing a place that is small, cramped, or uninviting

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Their office was a real hole-in-the-wall, but they got a lot of work done.
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The old bookstore was a charming hole-in-the-wall with stacks of books everywhere.
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dingycrampedpokyunassumingmodest
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holewall-to-wallwallblack holerabbit holedonut holetoad-in-the-hole