It's perfect. Visit the reunification palace, war remnants museum and the cu ci tunnels. it's a lot of history. Have fun!

It is safe but still like many places, you do have to take care of your own belonging and don't get drunk.

There are scores of massage places in the Pham Ngu Lao vicinity, ranging from hotel spas to small laneway shops. The area is literally scattered with them. Quality will depend on the therapist. I've had bad massage in expensive top-end places and brilliant massage in a cheap shop.

I think most hotel or hostel in this area has good air-condition and Wifi. I would recommend you Galaxy Hotel and Capsule in this area which my friends and I stayed recently in July. You have to walk into a small lane to the entrance of the hotel but it is very safe because there is a hawker stall right at the entrance which sells very interesting food. The rooms are very clean and so are the bathrooms and toilets. The wifi i our room of 5 also very strong. The young staffs were great, helpful and friendly.