What's the Name of That Book??? discussion

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Antonio S and the Mystery of Theodore Guzman
SOLVED: Children's/YA
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SOLVED. Children's book about boy who meets playwright/director? [s]
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What I remember is the MC's best friend came from a family of children all named names beginning with R. Friend may have been called Ralph. They or just the MC saw through a gap in the wall of an apartment building into this apartment with old posters from plays and movies. Eventually they met the man who lived in the apartment who was a big playwright or director, and when he died he left his miniature theatre, which had a little model stage and figurines, to the MC.
Thanks :)