You can request for painted walls or ask permission from the landlord. Everything's negotiable but be prepared to give concessions since the rental market is overheated here in SG. But if you are looking for a 3 bedroom unit and more, it may not be as tough.
You can find dishwashers in
condo units that have a lot of expats. That said, those units are more expensive to rent. Again, everything's negotiable....
I just managed to find a rental and it was a tough time coz I was looking at 2 bedroom units which are just going like hot cakes the moment they hit the market. Talk about having no leverage!