Location: Hotel Adler is conveniently located next to Frankfurt Main Station - although it was hard to find because it's tucked away in an alley. (it's actually right across from Levis Hotel)
Restaurants: There aren't too many around the area, probably have to search around the Main Station to find them.
Breakfast: included but not all that tasty
Service: Front desk is helpful and sincere. They let us store our bags in the lobby on the day we checked out. (The lobby is located on second floor, which is quite strange)
Given the price of the hotel, I would recommend it to people who are traveling on a budget and don't mind the small rooms and small beds. It's close to the red light district, but no harms there as long as you don't walk through the area too late at night.More