short letter

Hi Mayra!

I've been very happy since you told me (that) you're going to come here.

I think the best place to meet would be in front of the station, in a bar called "Sidrería". Well anyway, I'm average build, and I've got short blond hair. I'm going to wear a red t-shirt and jeans as well, so you can pick me out of the crowd more easily. And you? What do you look like?

I hope we'll be able to recognize to each other.

See you soon!!

It would sound more natural to say "I've been very happy since you told me you're coming here", but what you've written is correct. Also, nine times out of ten it sounds more natural to omit "that".