Adler Hotel Frankfurt

Exceptional

Liked: Perfect location
Disliked: Cleanliness

Good

Liked: Nice
Disliked: Nothing

Great value for money

Very good

Liked: Location
Disliked: Loud from outside

Very good

Liked: Plenty of different foods for breakfast. Nice and professional staff. Truly soundproofed windows. And it's right next to the train station, so it's perfect in case of a morning departure.
Disliked: It's located on what's probably the least nice street in Frankfurt. During the day it's not that apparent, but after midnight probably use taxi if you're a solo female traveler like me :) That's being said, one night I felt courageous and returned to the hotel by foot and no one bothered me beyond a few shouts.

Passable

Liked: The breakfast was ok. The hotel was clean.
Disliked: The locaton was unpleasant.

Best value you can find...

Liked: The place is clean, affordable, and provides a decent breakfast for the price.
Disliked: Can be noisy.

Very good

Liked: The hotel's staff is friendly, the rooms are clean, and it is conveniently located near public transportation.
Disliked: It's good

Very good