Stayed at Adina Berlin hbf for just two evenings. Overall impression was good, both rooms and service.
Service: excellent. Staff processed our early check-in at 7:45 am with no questions asked. Most hotels won't do this for you even if they have rooms available. All through the stay, staff were friendly and greeted us when we went through the lobby.
Rooms: clean and spacious. Modern design and had views of the hotel garden. We arrived over the weekend and were slightly taken aback when we woke on Monday to a view of an office full of workers on the facing block. Nonetheless, our stay was a pleasant one.
Others: Wifi is chargeable in room. A password can be requested for complimentary use in the lobby. Breakfast was not inclusive and costs abt 19 Euros.
Transport: 5 mins by cab from Berlin hbf. Hotel is serviced by two buses 142 and 147. Hotel staff can advise which to take to the shopping district and where to drop off. Buses are a flat rate €2.50 per trip if you dont have concession. Alternatively, a cab to Friedrichstraße or Alexander Platz was about €10-12. We had no problems getting around Berlin during our stay.