So I keep reading everywhere that the US and a few other countries took on Nazi scientists after the end of WW2. I'd imagine this is more like forced service rather than actually being hired though, so I'm curious, what was their experiences?
Were they monitored the entire time? Given accommodations/told to find one or forcibly kept somewhere (prison-like)? Were they given work assignments or were they allowed to choose what they wanted to work on? What were their interactions with their American colleagues like? Was this whole experience an opportunity they CHOSE, or was this imposed on them? Did they ever do interviews about the Nazi regime (I'd imagine lots of folks would be curious)? Were they ever allowed to leave the country and visit Germany (or anywhere really, like maybe a vacation or something)? Were they clandestinely monitored, or was it 100% obvious, like with cameras and a guard at all times? If they were ESSENTIALLY a prisoner doing labor, how was their personal lives, as in, were they allowed to have a significant other and 'intimate' times (cause if the only SO they were allowed were wives they married before or during the war, I highly doubt they'd ever get the chance to be romantically involved with anyone)?
First, your assumption that they were all prisoners is totally wrong. In the United States, they were lured by the promise of being able to do well-funded research and putting their Nazi past behind them. None of the scientists the US took in through Project Paperclip were coerced in the slightest. They were not kept under anything like prison conditions. They were, on the whole, kept separate from American researchers originally, but not entirely. The ones that became famous (like Wernher von Braun) certainly were asked about the Nazi activity in their lifetime.
In the Soviet Union, it was what was sometimes called a "gilded cage" situation, where the German (and Austrian, etc.) scientists and engineers were not treated like prisoners, but they were not totally free, either. It was made clear to them that their conditions of work and life were tied to their performance and effort, i.e. do well, and you get nice things (good food, a good house, etc.). Some of them were even able to make quite impressive negotiations with the Soviets: we'll do X for you, then you'll let us go in a decade. And in at least some of the cases, the Soviets paid out their side of the bargain (always post-Stalin, though), allowing them to emigrate again, sometimes even giving them money when they did so. That being said, their freedom of movement was heavily constrained in the USSR (as were all Soviet citizens) and they were not meant to interact heavily with other Soviets.
I do not know about their love lives, but again, your assumption that all of this was coerced or a prisoner-like atmosphere is entirely wrong (I don't know how much contact German engineers in the USSR would have with Soviet women). Both the Americans and the Soviets knew that the best way to get good work was not to try and force it out of such people. The Soviets were more heavy-handed in this, but even they understood that carrots work better than sticks (even if the sticks are still there).
Many of these scientists and engineers were able to accomplish much in their work for these countries. Wernher von Braun, of course, is the most exceptional example of this, but it is still telling that the head of Hitler's rocket program could become the head of NASA. For a Soviet counterpart in a slightly different field, the example of Gernot Zippe is instructive: Zippe was able to negotiate his own release, was given funds after being let go, and then took the work he had done for the Soviets (on centrifuges) and worked to sell it to the Americans, West Germans, Dutch, etc., making himself a tidy profit and a lasting legacy. Hardly the worst possible outcome imaginable.