Hi! We cruised on AIDAcosma at the end of February. It was just my husband and I, and we do not speak any German. We used Google Translator to translate all of the emails we received. We booked through AIDA's website, using Google translator along the way. The only way I could get the booking to go through was by paying with American Express. When we had issues (before sailing), I was able to call their 1-800 number and get help. The telephone menu was in German, so I had to guess what numbers to push, then there was often long holds, but if I was able to get anyone on the phone, their English was better than mine. I also similarly emailed AIDA a few times with questions. Since my emails were in English, they always responded in English. We had the drink package, the Premium All Inclusive. It was very cheap, like maybe $25 a day for the two of us? It included everything at the buffet and specialty restaurants but we didn't try the a-la-carte so I don't know about them. Each specialty dining restaurant's menu has a page on what drink is included with which package. (For example, click on the Ocean's menu
https://www.aida.de/v10/fileadmin/user_upload_v8/An_Bord/Essen_und_Trinken/Restaurants/Oceans-Das_Fischrestaurant/restaurant_menuekarte_oceansrestaurant_co_220224.pdf and you'll see the first few pages showing you the different drink packages and symbols of which is included in which. The link is in German but you can run it through google translate.) The room attendants and the waiters all seem to speak better English than German. The nightly entertainment was mostly in English. (One of the shows was called London Calling!)
We had sit down breakfast at French Kiss every morning.