HND Lounges:
I'm QF WP. I flew out of HND in April this year on QF60. I used the JAL First Lounge and I found it to be quite good. It wasn't crowded at all, food and drink service was table service (order through a QR code from your table and your order is brought to you). From memory, the menu wasn't expansive but it was acceptable. The shower facilities are excellent. The lounge is quite big so I am sure there are some parts that I didn't get to see. Overall, a great experience.
Transfers:
For transfers from HND, take a look at the Limousine Bus Service (
https://www.limousinebus.co.jp/en/). I used this both inbound and outbound. The network is quite expansive. My understanding is that each bus is basically a one-stop service - you get on at the airport and it travels non-stop to its end destination stop. It does not do multi stops. Luggage service is obviously included. Most (all?) buses have onboard wifi which can be good to help set up your tech on the bus trip in.
The bus was exceptionally convenient for me as the bust stop on the route that I took was a short walk from my hotel. A lucky convenience.
The journey to my hotel was very quick (in the Shinjuku area). QF60 arrives in the evening and the roads are pretty quiet in the evening it seemed to me.
You can buy tickets online in advance or at the airport at a ticket vending machine. Tickets are reserved and confirmed for a set route when you buy. Seating is unallocated. On arrival I bought a ticket from the vending machine at the airport and it was dead easy. There were very few people on the bus with me (less than 20). On departure, I booked a ticket in advance online as I wanted to have a guaranteed spot on the bus at the time I wanted. Again, a dead easy process. From memory, you can also buy a ticket from the bus driver for the outbound journey. There was no vending machine at the bus stop for my return journey to the airport. There were again less than 20 people on the bus.
If you can get a bus route that stops near to your final destination (or to a train station where you can catch a train for your last leg of your journey to the hotel) I would 100% recommend the bus.
After spending time in Tokyo and going through multiple train stations there on my tourist jaunts IMHO unless you are a seasoned Tokyo traveller there are far too many stairs and other complexities to navigate at the train stations with luggage and tiredness after a flight to consider the train station as the "best" way to get into or out of the airport vs. the bus if it is available.