The word "reasonable" is subjective and what may seem reasonable to the buyer may seem unreasonable to you. With that being said, it's "typical" that a buyer will ask for anything that is broken or dirty because they don't want to move into a home and have to fix or clean things right away. (unless they're fixer-uppers, of course)
I "typically" like to have my buyers ask for and my sellers fix the 3 S's - Safety, Security, Soundness (or Structure) and not just everything in the inspection report. It sounds like some of the items you listed fall into those categories, but not all of them. Was the concession you offered to be used for these items or was it off the listing price? If it was specific to the inspection items, it may be "reasonable" to politely decline the requests stating that the $3K will cover it. If it was off the top, it might be "reasonable" to spend another $300-500 to clean the carpets, fix the small things and have the HVAC looked at.
Remember, this is all a negotiation and your goal is to have a Win-Win situation. Put yourself in the buyer's shoes - if you were buying this home, what would you want fixed and cleaned before you moved in?