Gave birth to DD1 in the medical side, and DD2 in the Malden suite and would say the main difference was a more relaxed approach in the Malden suite; DH and I were largely left to our own devices and were actively encouraged to go out for a walk, get a coffee, whatever. Of course this may have had more to do with the fact that it was our second baby and we felt more confident ourselves, than it being policy, but it was generally a calmer, more relaxed experience. Saying that, I felt very well supported in the decisions I made for both deliveries, and certainly didn't feel pressured into any medical intervention for my first birth, the midwives were great for both.
I did prefer the rooms in the Malden suite (and was lucky enough to get one of the two with a birthing pool, though dd2 ended up arriving too quickly for them to fill it in time ); I think because they contained less medical paraphernalia. Agree with lemonaid that 'home from home' is not an entirely accurate description though! But both sides seemed clean and bright and had ensuite bathrooms.
As lemonaid said, the two sides are literally just opposite sides of the reception area, so I can't see how it wouldn't be possible for you to get an epidural if you needed one, they just don't encourage you to book the Malden Suite if you're pretty sure you will want one. Fingers crossed you won't, most second deliveries seem to be much quicker!
One word of caution - Kingston is an extremely busy maternity unit. So even if you do express a preference for one side or the other, there's no guarantee that's what will be available on the day. Bearing that in mind, I would imagine (but am only assuming) that an anaesthetist (sp??) may be available more quickly if you were already in the 'medical' side, (but you may still have to wait a while for one).
Hope this helps, don't mind answering any specific questions you might have.