Hi @Connor84 our cottage is situated between several well regarded local wineries. Before COVID we had a relationship with one where we did provide local wine and our guests got complimentary tastings. That winery is now by appointment only and probably not going to make it, which is a shame.
We have a symbiotic relationship with several others as they are (or were) event venues and our guests often attend weddings and need a place to stay in the area. One recent guest even baked a wedding cake at our cottage for a winery wedding! We do leave local bottles for guests rather informally since our state shut down and reopened over time. Here are my observations about offering wine on any level.
1. Not everyone drinks it. Hard to believe, but I have had guests offended that we left a bottle. Since that happened, we now ask before check in and will leave a food treat (we try to do something from a local farm in season) or wine as their preference states. Some people are very touchy about alcohol due to past experience or religious belief.
2. There are legalities to be considered. Our arrangement with local wineries was very much on a handshake basis, but we could have actually gotten in trouble if any money changed hands. We didn't get any kick backs but we did have many referrals for wedding stays and I am sure our guests bought more than a bottle or two from our favorite vineyards. If this is meant to be profit driven for you, you may need a license or local permission to provide these items.
3. Insurance. Look into it. If you are formally providing wine for guests and they get hurt because they are tipsy, make sure that you are still covered. Your premiums may increase if you disclose that you have an arrangement to serve people alcohol.
4. Identification and legal drinking age. You would need to check IDs in person for each guest and make certain that additional underage guests were not coming to the space to take advantage of your wine service. You may do this already. If not, at the very least you need to disclose in your listing and house rules that this will be the case, no exceptions.
I agree that this might be better suited to an Experience than an endemic part of your Airbnb. I certainly would love this as a guest. But if you want your space to appeal to the most people, its probably best not to have this as part and parcel of every stay. You can have people who are interested sign up for the service and any education or tours of the wineries nearby that you offer. That way you can charge accordingly and guests can choose to participate or not.