You know without the context it is pretty challenging to answer the question. The exact expression depends on the verb used.
For example:
He went downstairs. - Он спустился вниз.
OR
The kitchen is downstairs. - Кухня - на первом этаже.
Лестница (lestnitsa) leh-snit-sa
To say "go downstairs" in French, you would say "descends les escaliers."
Downstairs is "en bas" (literally "at the bottom") in French.
To say "downstairs" in Yoruba, you can use the phrase "nínú ìmúlẹ̀" which translates to "inside the bottom".
To say sweetheart in Russian you say dorogaya. To say I love you in Russian you would say, Ya lyublyu tebya.
How do you say "Dylan Smith" in Russian?
Trenatsat is how you say thirteen in Russian.
this how you say animal in Russian животное
Джиттербаг is how you say jitterbug in Russian
my wife and I in Russian?
To say "no" in Russian, you can say "нет" (pronounced as "nyet").
ночь, is how you spell it in Russian. you say it "nohch"