Lettuce doesn’t require much work, though you have to water well, and watch for slugs. I live in a area that is slug nirvana so its difficult to get a whole crop, though with diligence it can be done. Raspberries require more work than lettuce. For a summary see the post I made in reply to bethanyleigh on this same entry.

by easy. It isn’t difficult but it does require work to plant and maintain. I would say its a moderate amount of work though the initial planting is more because you have to also put in something to support them, usually posts and wire though there are multiple ways to achieve that. You can get metal posts you just pound in and the wire is readily available at hardware stores. Its best to do it with a friend and also read up on it a bit if you have no experience with it.
Of course you must also prepare the soil. If its grass now, then removing that will take quite a bit of work. If its a garden spot then just weeding and tilling then planting is all.
Also, raspberries are in the genus rubus and so bear fruit only on the 2nd year of growth. In other words, The first year they will put forth canes but no fruit. The 2nd year the canes that came the first year will bear fruit, then die when they are done. New canes will also come the 2nd year but not fruit on them. So you plant year 1 and do nothing but water and weed. Year 2 you can harvest fruit. After the fruit is done, you can cut those cans back to the ground but leave the new canes that don’t have fruit.
There are some hybrid varieties that bear fruit on the first year canes. You might consider those.
The whole process may sound complicated but it really isn’t. So if you truely love raspberries, its worth trying for 3 to 5 years to see if you are up for the effort. After that you can decide. So if you aren’t planning to stay where you are for more than 1 or 2 years, it wouldn’t be worth it.
Do you know what your landlord means by “all kinds of stuff”?
Does it mean more than 1 thing? More than 2?
If you decide to try it, spend some time to research which varieties work best for your area. There are varieties which won’t do well and will result in more work for you with little or poor payback (i.e. berries). I don’t know what works well in Pittsburg but an extension agent would certainly know. Also different varieties have different flavors. Some are just so so, others are fabulous.
If you decide to give it a try, I would suggest you plant at least 6 to 10 plants. They need to be spaced 2 or 3 feet apart so figure how much space you need for that.
You can plant fewer but of course you get less fruit. More plants than 10 start adding significantly to the overall work load.
I hope this helps.