Okay this is just to give a rough idea. The ISS is a bit over 100 meters long, and Star Trek Enterprise is 289 meters ranging to 725 meters
So, you wouldn't be able to pick out any detail with naked eye in the same orbit as the ISS. Except perhaps in ideal conditions, (see Alan Marble's answer to If the Starship Enterprise were in a "standard orbit" around Earth, how bright would it appear to the naked eye?), it would be just a bright star.
As for a Star Trek "standard orbit" - whatever height it is, it's a lot higher than the ISS.
This is a video of the ISS against the sun. Shows relative visual size of the ISS and the sun. And you can see a sun spot next to the ISS.
The original Star Trek Enterprise would a little under three times the length of the ISS.
Seems much larger on the inside - but the ISS though quite large in length and width, doesn't have much at all by way of habitat volume compared to Star Trek Enterprise - mainly solar panels and small corridors inside tubes packed with scientific equipment.
Brightness depends on its albedo. I'm not sure what the albedo of the Star Ship Enterprise is. It also depends on whether it is illuminated by the sun. As with the ISS you wouldn't see it at all when flying through the shadow of the Earth.
About the Author
