philodendron selloum

It's a haworthia, which is a kind of succulent. Eventually someone can probably tell you the particular variety. If you're planning on keeping it in that cup, you'll need to cut drain holes in the bottom.

Though I can't say what variety it is, but it does look like the typical succulent house plants that do not need too much water. Your last pic shows a very good soaking which is good for other plants, but may affect this one negatively. Anyway, it's good to learn about, but try to stay on top of it and if it looks in bad health again, just reduce some of the watering. It looks like the office mascot by this time. I do want to comment that until you could properly identify it, it looks like it may be leggy either because of lack of proper lighting before, or it might be one of those plants that "trails", so if it starts toppling over again, that might just be its attempt to be more horizontal than vertical, and not necessarily because of lack of water. I mention this because while in the original pic, it was being more horizontal (for which we don't know the exact reason yet), but in the second pic, you have planted it as a more vertical. It could be that it is a trailing plant.

Sans looks to be correct. See link on one that looks like yours....Maryl Epiphyllum