Good is quite subjective and depends on what you’re after: taste,?potency? both?…
I’d go fr nederhash (made frm indoor NL grown buds) fr potency.Most will get you high as a kite.Problem is that they often lack taste IMHO.And they are usually expensive.
Fr taste (my main concern!), definitely import hashes, main origins are Morroco and a bit of India/Nepal.
A clean hash (be it nederhash or import) should burn cleanly and evenly (no sparks!!) and leave no black ashes residues when combusted.But that you’ll say, you only know when you’ve already purchased it!
Read the latest travelogues and CS reviews to know what’s good atm.Batches change constantly.Quality is reflected in the price, and I wouldn’t buy anything below the 10 EUR/grm mark city center price (though there are exceptions!).Freshness is a key factor also.Storage is important too, as pressed hash will loose/change its taste much quicker than a lightly pressed one.
A GOOD hash should need no lighter nor high heat source to be crumbled into pieces.Palm heating is sufficient.
An EXCELLENT hash is when you are barely able to twist a spliff after crumbling it (or trying to

!), leaves your fingers gooey and sticky.
Recomendations from my last trip city center shops (mid october):
-Asian hash: Nepal from Utopia @ 10 EUR pr grm.Sweet sugary licorice/leather smell.Smooth rich spicy smoke.Pleasant dreamy high.Very nice example at a fair price!
-Morrocan: Jbel Tidighine (that’s the name of the highest mountain in the Rif producing area in Morocco BTW...damn silly names!!) from Betty Boop 11 EUR/grm (had 5 fr 50EUR).This shop always stocks good fresh hash at decent prices.Fresh blonde putty, turns darker and sticky with a little kneading.Notes of honey, fresh ginger root and pine resin.Smooth on the throat.The high was surprisingly strong and creeping, instant hitter, gets you clearly high fr the first 20 mins and then creeps up on you and gets you nicely baked fr an hour...
These were good, reasonably priced hashes, but I couldn’t find an excellent one (didn’t searched that much though, went by lastest ACD recommendations and personal previous experiences lol)
There are tons of others good shops…Amsterdam is the right place fr a happy hash hunt if you know what and where to look!!
-So...happy hash hunt!