Friend going to Saigon, any suggestions?

I would recommend using Air BNB. That way, you keep the room key and the AC can stay on all day if you wanted to. Hotels, you need to give them your passport and return the key every time you leave the bldg. Also guests are free to come and go.
Download the Grab app which is similar to Uber/Lyft. There's no more Uber there. You can pay with cash using the Grab app.

Thanks for the info

hi, you can book hotel on this web or app (the app: Traveloka) on your mobile phone
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Hi,

Airbnb is much preferable than hotels, if you are in a budget yet comfortable and cozy atmosphere experience with the locals or other travellers is a unique experience.

For places to eat. If you like local food street and want to experience the authentic local food. here's the link that you can refer..

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But the challenge here is the communication, since most of the food stall in local areas can't communicate in English, my recommendation is have a google translate that can help you on some of the basic words and google the background/description of the food then show the picture to the vendor., it's the best experience when you're not in a touristy places but rather experience be in local places 😉

Hope the above information helps you.