That appears to be a hardy perennial Geranium variety, one of the true cranesbill Geraniums (unlike Pelargoniums). Many varieties of Geranium, such as 'Wargrave's Pink', have smooth leaves. Leave it alone, unless you don't want it growing where it is - you might be able to identify it fully once it flowers later on. It's not a 'weed' as such, although the accepted definition of 'weed' is simply a plant that's growing where you don't want it.
Given that the geranium has a citrus smell, I'll identify it as Geranium x cantabrigiensis, either the basic hybrid or the 'Biokovo' cultivar. If it's Biokovo, it will bloom with a pale pink flower; if the basic hybrid, the flowers will be magenta. I find Biokovo to be a nice groundcover, spreading stoloniferously rather than rhizomatously, which means that it's easy to kill if you don't like it. The leaves in both spring and fall are scarlet. It's not a rampant spreader, either - maybe a foot or so a year once established.
This is possibly a species of anemone. The reason for this is that the plant form is a cluster of basal leaves with long leaf stems; it does not seem to be producing a tall main branching stalk which will carry the flowers. Possibly it will produce one later. Some anemones are known for their scent, for example the musky scent of Anemone nemorosa. Of course all will be clearer when the flower appears, as it certainly will given the nice healthy appearance of the leaves.