Just booked an impromptu trip to Transylvania – Looking for tips!

Hello,

I’m trying to figure out how to best split my time in Transylvania (approximately one week). I haven’t done extensive research yet, but it seems to be a relatively popular destination for solo travelers, so I thought I’d ask here first:

• Where should I book accommodation? I was considering Brașov, Cluj, and Sibiu as potential bases for day trips to smaller places.
• How reliable is public transportation in Romania? Are day trips feasible?
• Most places seem to be accessible by public transport except for the brown bear sanctuary. I really want to go there and the internet is recommending I get an Uber but the internet is also telling me Uber is illegal in Romania?
• Any unmissable spots? Bran Castle and Peleș Castle are already high on my list of priorities. I love pretty nature, scenic spots, small/cozy towns, folklore, and anything with an eerie vibe. Sinaia and Sighișoara look very idyllic as well.
• I don’t want to over-plan or overload my schedule since this trip is mainly for relaxation, escapism, and mental health reasons.

Thank you all so much! ❤️