Just before the bridge on the right going down from Ubud.

the treckking takes around 30 minutes non stop,if stop for pics taking,might be longer than that,not challenging,almost flat,sometimes a bit steep,but jusk ok.normally people stop around karsa cafe,and then turn back.if you want to go there,there is a stairs, but not steep.though the path quite flat,pram is not a good suggestion,but i think possible,certain part quite narrow,cuz many people,if you dont mind ,i think possible to bring your baby there,the starting point close to a temple,there is a set of stairs too.

Yes. It's always open. It's a free walk.

There are stairs at the end of the walk where it turns into a street, so if you scooter is light and you can carry it over the stairs, then yes - it's possible. The walk is not 2 hours. It's about 30 minutes depending how fast you do it.

Follow Jalan Raya from the center of town, cross the bridge and turn right immediately where you see the Ibah Hotel. From there are signs.

Yes, free if walking, I was there in August and noticed cars having to pay a fee to drive closer to the village end of the ridge walk which maybe what people are referring to, I noticed that scooters and people on foot weren’t being charged. This is at the keliki village end, from Ubud you just start the walk from the temple.

Haha - yes it’s fine in flip flops!

Super safe