Rosie: Not allowed to paint or stain the walls just because I have to leave the balcony as we found it (and wouldn't be able to do it. ) As for the drainage, there are two drain holes. There's little pooling of water (just one 4" divet that pools a little bit) so the drainage is good.
We are not allowed to slosh water on the balcony, just damp mop or preferably vacuum. The reason for that is that the water drips down onto the balcony below. I've been out on the balcony and had to come in because water from a balcony above is coming down on me. Since I can't be sure the water coming down isn't dirty wash water from a bucket, I don't want to put a carpet down. It would also be slowish to dry due to lack of sunlight. The tiles will drain well.
We are responsible for keeping the two drains (one in each corner) stays open so the tiles won't cover those. At least if I get my way (dh wants to cover them.)
Twins: I'd love to have a lounge seat like this:http://www.costco.ca/.product.100095405 ... ItemViewCP
But it isn't affordable or practical. I can't keep the pillows out and I have yet to see anything like this where the base is a storage unit for the cushions. So my 'recliner' is my zero gravity chair which is on the dining balcony because that's the one that gets the most sun (and because of the wind it is often chilly to sit out.)