das Aroma
aroma
A characteristic, usually pleasant smell or taste, especially of foods, drinks, or spices.
Das Aroma von frisch gebrühtem Kaffee weckte mich am Morgen.
The aroma of freshly brewed coffee woke me up in the morning.

aroma
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aroma
A characteristic, usually pleasant smell or taste, especially of foods, drinks, or spices.
Das Aroma von frisch gebrühtem Kaffee weckte mich am Morgen.
The aroma of freshly brewed coffee woke me up in the morning.

When you want to name the source of the aroma, you typically use the structure 'das Aroma von + dative' (the aroma of + dative). This is a very common and natural construction.
Ich liebe das Aroma von frisch gebackenem Brot.
I love the aroma of freshly baked bread.
You can recognize the figurative meaning by the fact that 'Aroma' (aroma/atmosphere) is connected with abstract things such as places, times, or moods. Typical verbs in this context are 'verströmen' (to give off/exude) or 'ausstrahlen' (to radiate).
Die historische Altstadt verströmt ein besonderes Aroma.
The historic old town gives off a special atmosphere.
An aroma can be described more precisely with adjectives. Common combinations are 'ein feines Aroma' (a delicate aroma), 'ein kräftiges Aroma' (a strong aroma), 'ein würziges Aroma' (a spicy aroma), or 'ein süßliches Aroma' (a slightly sweet aroma).
Der Wein hat ein sehr feines Aroma von Beeren.
The wine has a very delicate aroma of berries.
mood / atmosphere
'die Stimmung' and 'das Aroma' can both figuratively describe the special atmosphere of a place or time. 'Stimmung' is the normal and direct word for this. 'Aroma' is more figurative and sounds somewhat more literary or poetic. It actually brings to mind smell or taste, but is sometimes used for a special character or atmosphere. The words can be confused because both have a descriptive quality. In everyday language, 'Stimmung' is usually more natural. 'Aroma' fits better when you want to express a special, almost sensory atmosphere.

Der alte Markt hatte noch das Aroma einer vergangenen Zeit.
The old market still had the atmosphere of a bygone era.
Am Morgen ist die Stimmung in der Küche meistens ruhig und freundlich.
In the morning, the atmosphere in the kitchen is usually calm and friendly.