Hi Vasileia, thanks for making this question. It's pretty common to look for specific flavors and aromas in certain origins. However, it's quite tricky to know in advance how the coffee will taste only considering the country of origin.
So, I really hate to give this type of answer, but: it depends. It's almost impossible to accurately describe Colombian coffee as a whole, in terms of taste and aroma alone.
Coffee taste changes dramatically depending on several factors, including roast type, processing method, varietal, terroir, brewing method, and recipe. All these variables can be substantially different from one Colombian coffee to another, so it would be quite inaccurate to say that Colombian coffee tastes in a specific way.
Colombian coffee producers have made famous their country by growing dozens of different varietals successfully, always at very high standards of quality. Some of the best known are Caturra, Castillo, Bourbon, Tabi, Magaropipe, and -obviously- Colombia. As I said above, each of these varietals can display different aromatic profiles depending on many other factors.
Now, for sure, Colombian coffee has such high-quality standards, that it's hard to find some unpleasant notes easily found in low-quality coffee such as harsh bitterness, potato taste, or straw-like flavors.
On the contrary, Colombian coffee, particularly specialty-grade coffee beans, display a noticeable complexity, and roasters tend to develop medium roasts to take advantage of that.
That said, most Colombian coffee beans can show some mild and pleasant acidity, nice sweetness, and low bitterness, mostly because Colombian coffee producers tend to grow coffee at very high altitudes, which adds to coffee beans density.
Additionally, Colombian beans tend to have a medium body. Coffee beans' density and complexity make roasters avoid over-development. In my experience, I enjoy Colombian coffee the most in pour overs and the Aeropress for this reason.
Some of the most innovative coffee producers grow their beans in Colombia, and the now world-famous Eugenoides found its new home there.
I tend to choose Colombian coffee with confidence, particularly from good and reliable roasters, because I know coffee producers are very knowledgeable and quality-driven.
Overall, Colombian coffee represents one of the highest quality beans in terms of flavor and aromatic profiles available in the market, with incredible diversity and richness that's too hard to define accurately.