Visited on 9th July with my boyfriend on a date night. The service here is superb - everyone we spoke with was extremely friendly and helpful, making for a wonderful experience. Even the doorman/bouncer! It was a tad on the cold side inside but this was soon forgotten.
The drinks that we ordered were all very good (espresso martini, margarita, mai tai, last word and two others that I forget). However, the vast majority of cocktails are just the classics, which is a bit of a disappointment. They had one or two "bartender's specials" but it would really help elevate the experience, I feel, if they were to introduce a range of more interesting "signature" cocktails as part of the menu. So, minus one star for that.
Minus another star for the fact that this is the only place that I've been to (in London and Cambridge) that won't serve tap water, veiling behind the COVID excuse. They give you one complimentary 500ml bottle of mineral water, but after that it's £2.50 a pop, which is steep. Literally everywhere else I've been has not had an issue serving tap water, so this feels like a poor excuse to wrangle more money from customers.
Overall, I'd recommend Hidden Rooms for a cocktail experience, but I think I'd only really consider going back if the choice of cocktails is widened and the ridiculous "no tap water" policy is lifted.
EDIT - in response to the overly combative and defensive owner / bouncer (because you had a bouncer security licence on your arm, so you may be the owner but you're also a bouncer - like you, "I DoN'T ReAd MinDs"):
If you have 350 cocktails available, then state that somewhere, make it known. Whenever I go somewhere to eat or drink, I don't ask to see what's NOT on the menu I have been presented with.
If you are happy and willing to give customers 2 or 3 additional bottles of mineral water without charge, then make it the standard. Again, I can only make an opinion based on the facts that I have been presented with. Your menu very clearly stated that additional bottles are charged for. Why would I assume I can get any more for free?
So 3 out of 5 stars was probably initially harsh for the experience I had on the night, which was lovely, and probably warranted 4 out of 5 stars. But given the owner / bouncer is unreasonable, cannot take criticism, and likes to lash out at his customers, I'll keep it at 3.
Bye.