The scene is definitly underexposed unless that is the look you are going for which it very well might be. If you don't already have one, I would suggest using an incident meter for the next time you want to determine your f-stop. I rarely use the spot meter for determining where to set my lens. I tend to use the spot meter more for seeing the differences in my various light sources in helping me tweak my lighting set-ups to better support (or not support) my incident reading on my subject. This is how I was trained, it may or may not be the correct way to approach lighting a scene and shooting it at the correct f-stop, but it works for me. If all you have is a 1k to light your interior scene, you might want to try a faster stock, like Kodak Vision2 5218 500T. It's a great stock with minimal grain and it would give you a little more latitude to work with.
-Andrew Redd