Aqueduct -- I like to compare non-terminal +$2 to Silver, because that is often what it is -- a Silver+. The bonus for Aqueduct is that you get a mini-Cellar. This is a decent bonus. If you discard a junk card, Aqueduct was essentially a GM. Actually, that's pretty powerful... and then you have that nerf at the bottom, which I find quite unique. If you have Aqueduct and an attack in hand, you want to play the attack first. Of course, most attacks are terminal...
I like it, and I think it is correctly priced.
Rental -- This is often 7VP for $7. That's more VP than Province but at a lower cost. The caveats are that it gets top-decked when you gain it, it further junks your deck with 2 Coppers, and it actively discourages Copper trashing. This does set up some interesting tensions. It can be difficult to get to $7 regularly if your deck is full of Copper. So should you play for Rental and keep all the extra Copper, or should you ignore Rental, trashing away for a different strategy?
Worth noting is that it combos well with Trader, because you can replace those Coppers with Silver without lowering the value of Rental.
While this card is interesting in theory, I'm not sure it will play out that way in practice. As heron says, it probably encourages BM strategies too heavily. This is especially true if there is only weak trashing or no trashing available. The extra Coppers don't hurt that much. Just a Smithy is enough to hit $7 pretty regularly, even with a deck full of Copper.