Probably best as they are a busy place!
Reservations not needed, but sometimes they are very busy and you might have to wait 20 to 30 minutes.
Not in our experience but nothing to lose by doing so.
Sometimes you do. Depends how busy they are.
To be honest I am not sure if you require a reservation/appointment or not.
Those details might be on their website.
As we were staying across the road, we decided that we would just walk over and didn't even think we should have booked in advance. A lot of places will cater for walk-ins as they are used to that.
There must have been about 5 girls waiting in the reception area, so, we were either lucky, or, this is the norm.
Apologies for not being as specific as you may have wanted.
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3 Days in Ho Chi Minh City