"I don't want to violate some fine point of etiquette but I'm really happy to teach you as much science as you can fit in your head because... I like teaching things and don't like it when people starve?"

"I wouldn't want to leave you empty handed after your help, but I'm quite happy to learn whatever science you want to give me."

"Well, if I help you, maybe the person with gender transformation magic will help me."

"We've just got to hope someone as altruistic as you comes along."

"I'm not an altruist, I just like explaining things."

"The things you keep explaining are 'how to make smallpox less of a problem' and 'how to stop having famines'."

"I can explain useless things! Do you want to learn about Banach-Tarski."

"It's still a sign of good character that you opened with smallpox!  You still get points for that."

People should not think nice things about him. It's very uncomfortable.

"Do you wanna go up and get a hotel room? It might be easier for, like, getting you up to speed on tech."

"Sure. Though I can't stay too long. Don't want to get chewed out for 'what if you died in a ditch and no one found you.'"

"Oh, don't worry, Milliways stops time. You'll get back the exact moment you left."

"Oh, that's convenient." (There is probably some super useful way to use this property. The first thing Jing Yi comes up with is that he could get a drink at whatever time and it wouldn't be noticeable.)

"But if you close the door-- or, um, the window-- then Milliways will go away until the next time it feels like opening the door for you, which could be next week or could be never. --I loaded a bunch of stuff on my smartphone by opening the door and propping it open."

"Well, we'd better try and see how much science I can learn in one hit. ... And I'll also see about getting those books to you."

"Right! To the hotel room! --You have to pay for the hotel room. And food. I'm not using up my book budget on this."

"Oh, I don't know, am I really sure I want to spend money on saving lives? Come on, let's go."

Lev talks to the bar and obtains a hotel room.

The hotel room is done up in the best 2010s style, from the Impressionist paintings on the wall to the television to the minibar. For some unaccountable reason, there is only one bed.

Maybe bed sharing is a cultural thing it would be strange to draw attention to? He can pretend that's how it goes where he comes from, if he has to.

Ooh, look, pretty painting he can stare at instead of the bed. (The painting is impressively bland by 2010s standards. By 8th century standards it's impressively alien.)

"I, uh, guess we can take turns sleeping?"

"If you'd prefer that? Though I'm not sure sleeping in shifts would be efficient. I'm happy to sleep on the floor, seeing as I'm your guest." (Ingratiating himself to this altruistic stranger is worth a sore back and interrupted sleep. And he is happy to play the guest even if he is literally paying for this.)

"If you sleep on the floor you'll be tired and have a harder time learning things."

"If we sleep in shifts, one of us is also going to be tired and have a harder time doing things."

"I guess we can... share? What are the Landlords up to."

"Their ways are truly mysterious."

"We don't have two beds, we do have extra dimensional television."