Wow, that's pretty good ! I'll use this !
Also a good thing if your story takes place in a modern setting, I suggest using whatever games or tools you have to create the interiors and then use them as drawing references to get the furniture and perspective right with minimal amount of effort and maximal amount of fun. I made my MC's flat in the Sims and I can't wait to start using it for my comic !
Also, self promoting.
If you like endearing characters, mystery and investigation with teenagers, you'll be in for a little ride !