I host a private room in our house and include loads of things (which has since transformed my ratings for the positive). I spend about 7 euro on each stay for amenities and include that into the overall price of their stay. I thought about what a traveller might need during their visit, and I put some things in different places around the room ->
For snacks - in a fancy tin bucket:
1. Pocket tissues
2. Instant cup noodles with x2 silver forks
3. Breakfast bars
4. Face masks
5. One type of fruit (usually banana, as it matches colour of our room's accent wall)
6. A chocolate bar, if I remember
7. Postcards with stamps on them (only for guests visiting from far away and are staying for more than 3 days)
8. A lavender sleep spray that I keep refilling with lavender essential oil and water.
On their ensuite door:
Personal robes and single use slippers
Toiletries:
High end luxury shampoo bottles that I then clean out & refill with regular shampoo and conditioner.
I also include some OTC travel related medications like remedies for a hangover/muscle pain/ upset stomach... As well as toothpaste, shaving gel, gendered deodorants, dry shampoo, face wipes, hairspray, tampons, pads. I mention everything I provide in my listing, but find that guests barely use any of the amenities because they never read it before booking. They tend to pick up their own stuff in the airport or whatever.. So I only have to refill these every 6 months or so.
Tea and coffee station:
Electric kettle with brown and white sugars, Canderel. Then 10 types of herbal tea and regular Breakfast tea. UHT milk sachets and a mini pot of honey. Then also a corkscrew, some filtered ice water and water cups and mugs.
For extra heat (in Ireland):
Electric heater, hangers, extra blankets and water bottle
Charging devices:
Sockets with USB ports with multi-device charging cables already plugged into these. Then two seperate universal travel adaptors on each bedside table.
Tourism resources:
A letter holder with loads of tourism brochures and leaflets that I've collected around my home city. To add a touch of thoughtfulness, I then made a jar of 150 things to do in Dublin. Little pieces of paper all crumpled up.. organised by colour into day/night/eats.. And then guests can pick at random for some spontaneity. They seem to really like the fun of that and compliment it in reviews.
TV Streaming:
In the room we have a tv with access to Netflix. then an instruction leaflet on how to turn it on and get to the correct channel (laminated and folded to sit on top of the screen - looks hotel-ish).
On the bed:
I leave a laminated welcome leaflet with the same style as the leaflet on the tv. On the bed leaflet, there's numbers for doctor's, A&E, guards, etc. And then also a list of info about how to book taxis, where to print boarding passes, public transport, tipping etiquette, off licence info.
Finally... A personalised welcome letter board, where I greet the guests in Irish and change their names each time.
So basically, it's a lot, but it's given me glowing reviews and I still manage to make a profit and makes the set up seem more professional. I get all my stuff in bulk on Amazon, so you're spending a quarter of the price on these amenities and they get delivered to your door.. so much less hassle.
I hope some of these tips might be helpful !