Yes, tends to be a very safe place for solo female travellers.
But take all the normal precautions and be very careful at night.
Stay out of the neighbourhoods where gap year students and criminals go to buy crack or heroin.
Saigon has a problem with groups of female thieves on scooters snatching phones and gold jewellery at night.
There are also a small number of male pickpockets and all sorts of scam artists that will try to get their hands on tourists id. But these small time local criminals tend not to use violence.