OP I live in an urban jungle and have probably about 50 houseplants. I also propagate (grow) my own from cuttings.
If you are new to houseplants, I would suggest one of the hardier plants that are very hard to kill. Snake plants and ZZ plants don’t need watered a lot, in fact the ZZ can go months if you forget to water it.
Pothos plants are another variety that are great for a beginner, particularly the golden pothos. It doesn’t need much light although it thrives in bright light - the leaves will change colour and become variegated in bright light.
For a bathroom you are best picking a plant that thrives on humidity like a peace lily or fern, but ferns can be a bit tricky to get a good balance with at first. The peace lily is much easier. So are Spider plants - they go great in bathrooms or any room really and very easy to maintain. They also throw off baby spider plants to grow into new ones.
If you go to an Aldi and Lidl you will find amazing plants for £3.99 - £5.99 every Thursday, try the mornings if you can as when the new plants go out and they get snapped up.
Remember though that you will kill a houseplant more if you overwater it than underwater. There are great tips on Pinterest for caring for plants. Whenever I get a new one, I usually save some pics and info on care to keep me right. Reddit have an amazing houseplants sub where people share help and care tips, photos and the people are not cliquey.