Welcome to Hk.
First off, walk up buildings are old. That's the fact of it.
Happy Valley is dog friendly but your budget of 19k is for a studio. Realistically aim for 25-30k and you'll be alright, if you get an older place you might even get a view of the race course.
Do not plan to walk 18 minutes in the heat to work. You would literally die. Look at buses but going though the old tunnel is going to be your new annoyance. But we all have our issues.
Is this your salary for one person or two? You also need to consider your tax bill too.
You will be able to save but you have to be disciplined. Clothing and shopping, food at the supermarket are expensive.