"My stay was okay overall, but I had a few issues that made it less comfortable. The bed and pillow were not supportive, which led to an uncomfortable night’s sleep. Additionally, the bathroom lacked basic supplies such as a shower cap and other amenities I would normally expect
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This wording keeps it professional, constructive, and balanced—it explains why you gave 3 stars without sounding overly harsh.
Would you like me to make it shorter and more direct (for quick reviews), or keep it longer and detailed (to give more context to future guests)?