Am pretty sure it's some kind of citrus, but I can't tell which one. They might have a good guess over in Citrus Forum, or you could just wait and see what grows when those luscious flowers fall off. I'm almost doing a Pavlovian swoon just looking at your picture!

Here is a link that might be useful: Calamondin orange

Mash the leaves, smell if there is any citus-like order.

Yeah, looks like a nice healthy citrus to me too.

I agree it's a citrus -wonder if it can survive winter inside.

Now it is ready to eat ...

Strange, I remember there is a citrus forum. But I do not see it in the list.

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Your little tree looks great! There's a citrus forum on GW.
Karyn

Here is a link that might be useful: citrus forum