How long has it been on the market?
How much interest from potential buyers have you generated? If very little interest, then perhaps you should consider the offer you have. Remember the expression "a bird in hand is worth two in the bush...."
Is it priced according to current market value and current market environment (seller's market) -- or is it over priced, doesn't show well, or in terrible condition?
What do you consider "reasonable" in terms of price, terms and conditions?
If you have a realtor representing you, your realtor is in the best position to advise you because none of us have the information we need to respond satisfactorily.
Anyone answering your question will be at a great disadvantage due to the fact very important information about your property is missing, such as, the details of your property, how long it has been on market, condition, upgrades, neighborhood, etc.
Your RealtorÂ® would/should have performed a Comparative Market Analysis to suggest a Listing price. If the offer meets your initial goal then perhaps you should consider taking the offer - or not.
This is a discussion you should have with your RealtorÂ®!