I only stayed 1 night as I was in between friends stay. The room was small even for Hong Kong standard but it was expected as I only paid GBP40 for a double! Just remember there's always a catch. I didn’t mind as I only slept for a few hours and it was clean and had it’s own compact bathroom. Air-conditioning and TV all worked fine and check out was a piece of cake. Location is fairly convenient. It’s in a fairly local area of Wan Chai away from the cheesy bars, although if that’s what you want then it's only a few stumbles away at the end of a night. It’s about a 5 min walk to the MTR, the tram stops are even closer and there are plenty of buses and minibuses towards Central. It’s cheap and cheerful and probably good for someone not wanting to stay more than 3 nights.

pros
good position close to the wan chai area and metro
recently renewed bathroom
comfortable bed
clean room
efficient air conditioning in the room

cons
small room
minuscule lavatory recessed between 2 walls at 20 cm distance, hard even to wash your teeths
no elevator and no air conditioning in the stairs
price high compared with the hotel class

We loved our stay at Mingle By The Park. The bed was big, the bathroom was clean and the air-con was fast and effective. It is only a 5 minute walk to the MTR (subway) and has a great variety of eating and market shopping places nearby. The Wifi was very good. It dropped out about once per day but only for a few minutes; otherwise it was very fast. We used to live in Hong Kong so were very used to the stair-well access to the road but honestly, one reviewer here said this was unsafe however HK is one of the safest / crime-free cities in the world so this really isn't an issue. I actually enjoyed the anonymity of coming and going as we pleased without the hotel staff seeing us.
I only had one time I called front desk. I wanted to make a cup of tea but there was no sugar. They informed me the hotel doesn't supply sugar but then about 10 minutes later a porter knocked on the door with a few sachets of sugar. Having lived there we were also used to the compact way HK people can make a room. The only thing I thought was too small was the wash basin as you can't fully lean over the basin while brushing your teeth / shaving but in reality this is not really a big deal.
I would definitely stay in this hotel again.

Stayed at Mingle Place By The Park for 8 nights and thankfully i had prepared myself for the small living space (based on other trip advisors)! If you are a no-fuss traveller, on an average budget and intend on spending most of the day exploring the city then you won't complain. The location is perfect (right down the road from my favorite HK Style cafe) - Wanchai is my preferred area to stay in!