I visited Hot House because for a work lunch and was surprised to find such a large venue like this in downtown Toronto. Because of it's large size, I noticed that a lot of big groups end up here which when I visited ranged from medium size groups of professionals to families / tour groups. The prices were fair considering that the styling of the place was pretty old and traditional - more of what I'd expect to see at a restaurant in the suburbs than in downtown Toronto, but then again I am more of a person who dines for the overall experience rather than just one key thing like the food / novelty / decor. I ordered the vegetarian pasta off the menu and my waiter somehow managed to write my order down as 'with meat'. I had to send back my plate and the staff were very attentive in fixing my order for me - the manager visited my table to apologize and even comped the meal.
In summary - Fantastic service and great for big groups. Don't take anyone you want to impress here as both food and decor are very meh.