You've got the right idea, but it's in good condition
S. If it were in bad conditions, it might just be being rained on!
Also, though you may already know this (it's sort of implied by the word 'repair'), the wall has been repaired at some time. A newly-built wall wouldn't be called 'in good repair' - at least, not to my ear. What do other teachers think
Student or Learner