The four star rating is on the price and song selections. They have different size rooms and the prices are pretty decent when you split the cost among the people. It's normally under $20 each person for a few good hours of singing some good ole ballads.
they have soju and beer (personal like for soju) and lots of different instant noodles and snacks for purchase. This place reminds me of the norebangs (Korean singing rooms) and comes with fond memories.
The rooms could probably use a little bit of upgrading but you're not really in there to admire the decor. The songs are regularly updated and Twister is pretty good of the having the new and fun stuff. They also have songs from in different languages.
The location is pretty great, off the yonge line at Finch station, close to 24 hour Korean pork bone soup restaurants and they have a Korean food cart stationed close to their front door.
One of my favorite choices for karaoke in the city, compared to Bar+ Twister is a definite winner :)