What's a Craft way to achieve extra info on specific relationships?
One solution I've come up with is to add a Matrix field that has two fields:


Text Input
Entries Field


Add that field to the "Services" field layout. Then you could add a lookup on the "Boston, MA" page when you iterate over related Services. Do a lookup and say, do they have a Matrix entry that is associated with this entry, and pull in the Extra Info as appropriate.