Romania in February/March

I'm wondering if there is anything that is a "must not miss" during these colder winter months?

Brasov and Sibiu, like at any time during the year.

So far we've only booked our flight into Bucharest (18th February) and nothing else. We were thinking maybe 2 weeks:

You could do something like this:
1-2 days in Bucharest
3-4 days in Brasov (with day trips to nearby sites)
1-2 days in Sibiu
1 day in Cluj
3-4 days in Maramures
2-3 days in Bucovina

Hi ktack,

Thanks very much for the advice. I really appreciate it. We'll start planing out our trip and accommodation now.

We haven't planned to hire a car for any of this trip. Would you recommend it, or a local guide, for any particular city/region? We're keen to get a more local experience for part of this trip (even given the short time frame we're there for).

Thanks,
Af.

It would be a good idea to rent a car for Bucovina and Maramures, public transport to many interesting places in these regions isn't so great.
A guide wouldn't be absolutely necessary.

In Maramures you dont need a guide really you will be able to get a lot of information from the people who run your accommodation. In February its likely to be cold and theres likely to be snow at Cavnic if you fancy ski-ing. The villages may not be there usually lively selves but because the farmers have little to do in the winter the bars are likely to be busy. You shouldn't have to much trouble getting around the train usually runs and there are buss to Buchovina and Baia Mare.