Romania

Romania is a great country to visit. It has tonne of cultural sights, a lot of interesting history. And the roads are generally in good condition, however, riding backroad adventures, you will get the occasional terrible roads with big potholes. So take it easy.
Passport: Yes
Yes. Although Romania is part of EU, it is not Schengen, so they will check your identity at point of entry.
Green insurance card: No
Technically not needed, being an EU member country. And they will not ask for it. But get it anyway.
Vehicle Registration Certificate: Yes
Yes, always. The original.
Toll: No
No, not for motorcycles. It is hard to find where it officially states that motorcycles are exempt, but they are. You can’t even choose motorcycle as category when buying online. https://www.e-rovinieta.ro/en/
Condition: Medium
Medium. The roads are generally in good condition suitable for all sorts of motorcycles, around more popular places, and roads. Travelling backroad adventures, you will get into bumpy sections with serious potholes.
Road Safety: Medium
Roads are generally good marked, but as horse carriages, and livestock use the roads as well, you need to pay a little attention.
Dogs will often run at you. The don’t appear to have depth nor speed perception. Crazy dogs. On gravel sections, if protecting a herd, they have been reported to be aggressive.
Romanians are more willing to take changes in traffic, so make sure you are seen. You know, the usual, stay out of their blind spots, anticipate traffic.
You: Good
Nobody will attempt to kill you.
Bike: Average
I would find secure parking. Either garage, backyard, or similar. I have never had issues finding safe parking. Just because that makes me sleep much better. I have never had anything stolen from my bike in Romania.
Cell
Cell phone coverage is good, except in the mountains. Do not expect to have coverage unless you’re in a town. For that reason, if you book online from day to day, do not expect that availability on sites e.g. hotels.com or booking.com is accurate. They may not have vacancies. Nor can you expect your reservation to go through to the facility even though it went through on the site. This has only happened to me on lodging in the mountains, and booking the same day. Otherwise those services work fine.
Wifi
All hotels have wifi, but some aren’t too fast, and they don’t have many access points, so though there is wifi, the signal may not reach all the way to your room.
But hey, isn’t it much more fun updating the social media from the bar with a beer in one hand?
Language: Romanian
Some areas in Transylvania, they speak Hungarian. And there’s a few more. But unless you know those languages, you don’t really care. Most younger people speak English.
Alphabet: Latin-ish
No need to learn Cyrillic.
Currency: Romanian Leu (RON)
Check this link to see how much 100 Leu will set you back.
There once was a currency called ROL. It died. I don’t know the cause.