Stayed here recently.

Pros:
Location is good
Close enough walk to the U-Bahn or right next to a popular bus stop with M29, 100, etc. running
Lounge is a standard European mid-level hotel lounge
They allowed both rooms I booked to have my breakfast benefit
Super close to Tiergarten and Victory Column

Cons:
SNAs cleared to one type of suite but then they downgraded me to a lower level
Decor is from the early 90s (or earlier?)

It's a below average Sheraton for how old it is but the staff are very nice and friendly. I would consider staying again if the price is right and I need to be in that part of Berlin.

-RM