Thought I'd add an English review, for non-German-speaking travellers visiting Frankfurt who like…read morethe Blues ... we had a great night at Orange Peel.
The entrance off Kaierstrasse might cause you to look twice - go through an old passageway, on your right is the cloakroom and up the stairs is the Orange Peel bar itself.
Unlike many other places in Frankfurt, this is an easy-going, un-self-conscious venue, with a friendly atmosphere, unostentatious interior and broad mix of clientele.
We got there just after 9pm for the Tuesday blues night, and the crowd (thin at 9.15pm, packed out by 11.30pm) was a mix of students, middle-aged types, hipsters and grey-haired blues fans. The booze was pretty cheap and the bar service was quick and friendly. No food - eat before you come!
Most importantly, the music was very good. The house band played for an hour, serving up well-executed blues tinged with a hint of funk - one or two standards (like Hoochie Coochie Man, which they nailed) and some rarities. Although the leader is Tommie Harris on drums, the MC'ing was done by the guitarist, who chatted away to the crowd in a mix of German and English (at least half of the band are originally from the US as far as I can tell).
The second half of the evening was 'open stage' with all comers welcome to join the house band for a number or two. Fun times; we were sorry we had to leave before the night was over. The crowd were still cheering on the band and the open stage guests, who ranged from OK to excellent. If you bring your guitar, and you know the opening licks for 'Jonny B Goode', then you too might be able to join in ...