I have been going to the English Theatre for the past 15 years and I must say that the quality of the productions, the variety of the shows (musicals, plays for kids, theatre plays from the UK and the US, etc.), and the seasonal events (talks, parties, etc.) have often been brilliant. This is the first place to look up when one is looking for entertainment in English in Frankfurt. The staff is friendly and you can order snacks and drinks for the intermission. The prices are adequate, and the whole experience is well worth the while. Highly recommended!