I have stayed in a number of Radisson Blu hotels and it is difficult to fault the room standards. I read with amusement on the reviews commenting on the shower set-up and it is perhaps a little strange; then again, I could count on one hand the number of times I have found a standard hotel plumbing system and sometimes think there needs to be a tertiary degree on working out how not to have the shower head spray you as you first turn on the tap. I also concur that the Heat Restaurant has a reasonably limited menu for a hotel of this size; however, the meals I ate there were very good and the breakfast buffet is certainly up to a high standard. But if location is a key decision in choosing a hotel, you need to think whether this hotel is your best option (and for me it was). If the Museums and nightlife of Mitte are your thing (keeping in mind the many offerings in the Mitte area can get noisy) then the Radisson Blu is located well, being right at the start of Unter Den Linden next to Berliner Dom. But if the Parliament, Checkpoint Charlie, Zoo and Tiergarten rate higher, then closer hotels would be a better option. I was also not aware of the large amount of construction being undertaken along Unter Den Linden for the new subway and around the Hauptbahnhof so transport times (should you be using a taxi) are longer than normal if you are not close to where you want to be. I used the spa facilities and they were of a good standard and the huge cylindrical aquarium in the hotel lobby is certainly visually stunning. I also found most staff to be friendly although service on one or two occasions was a little slower than I would prefer (but thats a personal view). Overall, I have stayed at better hotels but if the Museums are your main interest, you will be hard pressed to find a better location; they are a 10 min easy walk.