Only think you need a bench for is bench press, otherwise your good.
With that in mind, might wanna consider dips and/or find women of varying weights, have them sit on your back for pushups, gotta maintain progression of load.
Check yard sales, etc. or evilbay for a bench, get one with narrow bar towers, take the leg extension attachment off and you should be good, as that would take up the least amount of room and be cheap. Just double check what your getting, make sure it will support you and the weight your using.
If you have an extra couple hundred bux, you can get an FID or utility benches, dont have bar towers, multi-adjustable all the way to military press position, some have leg attachments some do not, either way they are removable. Due to my lack of space at this time, thats what Ive resorted too, with dumbells. The previously mentioned are the cheapest though, as they are more common to be dust collectors.
I found one at a yard sale, took them to $2...haha....Im pushing its limitations, so Im about to get a FID bench to support some real weight.
Good luck