After searching for weeks, all hotels in Hong Kong are either way too expensive or way out-of-the-way. Casa is, by far, the cheapest with the most convenient location I could find online. We paid in full for 3 nights upon check in and the curency was converted on the spot when my Malaysia issued credit card was swiped. For the first time, in using credit card at foreign country, I was getting such a disadvantageous exchange rate. To be fair, I don't know which party (hotel or HK bank or my bank) was to blamed.
As for our standard double room, it was very small, comparable to Tune Hotel London that I stayed last summer. It took a little practice to figure out how to shut the bathroom door with me inside and how to wash my long hair in it. My tips? Remove the dustbin and extra towels from the toilet for more space. On first morning, we were woken up by noisy neighbour and their children running and shouting along the corridor. Luckily they checked out on that day.
Cleanliness was overall ok and I did not get any bed bugs bite. The cleaner is helpful and friendly.
I was very satisfied with the location of Casa Hotel. Yau Ma Tei MTR station entrance is just a few steps away and there's a lot of bus stops nearby, including the stop for Airport shuttle bus. We walked to the busiest shopping streets (Fa Yuen, Sai Yeong Choi & Tung Choi streets) every night and Langham is not that far if one is willing to walk. Finding food is never a problem here.
One thing you might want to know that, Portland street is right behind the hotel. There are a lot of eateries here but also many prostitutes standing at the street. However, they did not pose any problem to us and basically the place is quite safe even for a single lady to walk (as long as she dressed decently).
Upon checked out, they were very willing to store our luggage while we went out for more shopping. I know a lot of hotels provide this service, but Casa actually helped us to store luggage in a proper storage room, instead of just leaving them at the lobby/reception area.
All in all, I would recommend this place to anyone on tight budget and only looking for a clean place to sleep.