Hotel Falk is ideally placed for visitors to the big trade fairs in Frankfurt who just need a roof over their heads for the night, as it's near that part of town, and not a long drive from the main train station or the airport. For a couple of days it's fine, but I would not recommend staying there if you need to be in Frankfurt for longer than that, as the location is not ideal.
My room was small, the mattress a bit soft for me, the duvet was very light and the pillow was so lumpy it was hardly offering any neck support. Cleanliness was very good, and the staff were all very friendly and welcoming. However, my room was at the end of a long corridor, which made it feel a bit like a rat run, and it was quite small. The decor was fine, a bit dated but well kept. The room also started to smell of food very early in the morning when the kitchen starts preparing the breakfast, the smell was so strong it woke me up. Breakfast was plentiful.
So this hotel ticks all the basic boxes - clean, friendly, accessible for business types - but if on a private trip I would not stay there again.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC