Don't go after rain. It will fully coverd by fog.  If you plan go up by morning but yesterday night raining also dont go. 
Used Grab / booked transport from Klook.  Grab approx. 300-350k

1. Last time I went they dont have any timing restriction/off-limits issue, just like a regular temple so I guess any time is ok.
2. No guide required unless you want some historical stories/background and its not complicated. When I went last time, we just booked a driver+van, and he dropped us there for us to walk on our own.

IDP i got, valid for 1 year.
but i worry of parking at Da  Nang place like those tourist spot area.
is it easy to park? how is the traffics at Da Nang?

Thanks bro. pretty much as what you say.
Just that need to be ready to hike and prepared for steep steps.

Bro, any cool recommendations beside Ba Na hills and Marble Mountain that in your opinion its worth it.

hi all,
I am planning a trip to Danang & Hoi An. Will give Hue a miss as I don't have enough time.

A few questions...

1. What is the time of the year to avoid travelling to Central Vietnam?

2. How to get from Danang to Hoi An?
Since ayam B40 on solo trip, not gonna hire a private driver.

3. Money matters
To use cash, credit card, Wise card or QR code?

4. Traveling around Danang & Hoi An
- Taxi, Grab, or motorcycle hailing?
- Can we rent bicycle in Hoi An?

5. I might need to travel with my laptop (ayam working everyday of the year). Is it safe to leave the laptop in the hotel during the day?

Please advise