Spinstorm

I am hoping that the vast experience in this forum can answer a few questions for me:

1. I booked an Avios redemption to male on 8th on the direct 777 BA flight. Where should I sit on the 777 as a lone passenger?

There appear to be seats in every row available in economy.

2. HOTEL - I haven’t booked a hotel yet. There are some deals like the Curio for £600ish for 3 nights all inclusive. I would love to stay at the St Regis or Waldorf but I don’t think I can justify that expense. Any suggestions? I have around 60,000 HH points and 20,000 Marriott which won’t get me much of anything there but maybe someone has an idea?

3. TESTS - Where do I get a test for COVID in time for the flight?

Thanks!