What are recommendable coffee roast types for Aeropress?

Coffee taste is indeed subjective. However, there are some things you can look for since the added pressure (versus drip) can force extraction of flavours you don't like. Below are some of the drivers (Disclaimer, I don't use the Aeropress):

• Oily beans: Towards the end of the roasting process the coffee oil can seep out (sweat) and you end up with beans that look wet. This may turn out ok taste with drip coffee, not so much for espresso types.

• Roast Colour: Drip coffee roasts tend to actually be darker and most espresso roasts are usually lighter in colour (see illy or LaVazza Oro). This may be to compensate for the forces of added pressure extracting deeper and more into the bean. There are exceptions to this (Bar Mexico in Naples uses dark roast but on a manual lever machine).

• Bean Type: Aeropress might handle some robusta (similar to Muka) as opposed to pure Arabica. More than 40% and imo your coffee will taste like earth.

• Grind Size: Each bean type and locale and roast level will require minute grinder setting changes. You can make the best roasted beans taste awful with the wrong grind. Try varying your grind from fine to super fine and experiment. Usually the higher pressure requires finer grind with the exception of turkish coffee.

• Dosage: To the get right extraction, a balance of pressure, grind size, and dosage is required. Good cafes measure their dosage to ~0.1gram when setting their grinder. If you find the coffee starting to clear up too fast in your extraction try increasing the dose.

To answer my own question a bit, one recommendable combination seems to be a medium-dark Espresso roast as fine ground powder, and then to brew for a short time.

Perhaps this helps others as a starting point for experimentation.

Roast level is almost entirely a matter of preference. You will most certainly be extracting different flavors from the coffee, because different compounds develop through caramelization during the roasting process. Otherwise, that doesn't affect how the coffee brews.

The Aeropress is suitable for just about any coffee that you care to brew with it. You can use whatever roast tastes best to you.

Having used the AeroPress for about 5 years, I can agree with logophobe that it works with any kind of roast, any bean. I'll adjust the brewing time (10-30 sec), water temperature (80 C for dark roast, 85 C for lighter roast is recommended), and dilution to achieve the results I want. I like an “automatic drip” grind because it drains fast, allowing good control over the time the water is on the grounds.

I don't believe pressure is a factor here. The AeroPress needs only a little bit of pressure to work - https://www.javapresse.com/blogs/aeropress/can-aeropress-make-espresso says 0.35-0.75 bar (they reference the AeroPress website, but I can't find that info there), which they call 25-50 pounds (that may be an error - when I do the calculation, I get 5-10 psi), but it's up to the user. I feel like it's barely more than the weight of my hand. It takes more pressure if you use a finer grind though. An espresso machine, by comparison, uses about 9 bar (https://aeropress.com/faq/does-the-aeropress-make-real-espresso/).