Toilets are generally where rehearsal spaces let themselves down. I can usually put up with sticky rugs and a mulch of detritus in the room but to discover there has been a dirty protest in the lavs is just awful. To name and shame one of the worst, in a moment of madness I had a try out with another band at a place called London Road Music Tuition along London Rd in Leigh. Dear God. Set the bar, even more disgusting than a petrol station in the wilds of Mexico that was the previous winner - at least there is a sense of exp[ectation that public toilets in Mexico (should you actually find one) aren't going to be clean.
My band are extremely fortunate - drummer is a farmer and on site is a listed 12th century thatched barn. 30ft ceilings, superb acoustics, fitted kitchen, toilets. The family used to use it for weddings but stopped so now it is pretty much a play area for his kids and our rehearsals. We keep the pa set up in there. Mind you it is bloody cold in winter!
Here's a promo shot from when they used to hire it out.