Best way to get 2 cats to be more comfortable with a big change?

Due to some problems with my bfs place, his cats cant stay there for a short period. This will be minimum 2 weeks. When I heard this I immediately suggested they stay with me as I do not want them staying in a kennel. I want them to have the best stay possible but my place is pretty small and we will be staying there with 2 humans and 2 cats. Its a studio appartment so I cant really give them a room to have a quiet hang out spot. ​One of the cats is very shy, another reason I dont want her with strangers.

Im a little afraid they will get nervous and pee on my furniture as my own childhood cat did that when she was somewhere unfamiliar.​​​​​​​​​ Of course, this is better then them having a horrible experience in a kennel, but something that did cross my mind. ​​​We wont be letting them outside since they dont know the neighborhood and im in a busier part of town so they arent used to the traffic here. This does mean they dont have a lot of space. ​​​​

How do I make this more comforable for them? Is there anything I can prepare to help them adjust? My bf and his clothes will also be there too so at least some familiar smells.​