Very very nice place! They assisted us in every way possible. Even before our trip, they answered all our inquiries. It was such a pleasant experience :)
Small space (typical in HK) but they were able to make the most out of it. Room even had a small table and the bathroom had shelves. Wifi is also very fast. There were toiletries and towels and even cups provided. There was also a smart TV in the room, which was an added bonus given the price we paid for the place. They even let us borrow adaptor plugs and a hair dryer. They were very very accommodating and helpful, would definitely come back again. Place was also really clean, and smelled really nice too.
Place was also very easy to find (there's a sign on the door of the bldg where its located) and surrounded by lots of shops and restos and convenience stores, as its right in the middle of the Ladies Market in Mong Kok. Also very near the MTR D2 exit, and the A21 airport bus stop.
They do require a deposit of 100 HKD. But it wasn't really a problem as they gave it back immediately after we checked out.
All in all, it was a great experience.