The second house looks a bit weird since the two sides don't seem symmetrical - but that's all in order?
Somehow it still looks somewhat skewed, but fixing it seems hellish so I dunno! : D



These semi-detach buildings are built in front of a curved roadside, thus appearing to have a wedged base. Given it was first constructed using the line tool and measured, it's probably symmetrical, although it's hard to say if it's properly aligned to an isometric projection. It's the same deal with the market (to the right of these buildings).
i know you're going for a stylish look, but what i see is
the walls are too light *comparing to the red roofs*
maybe try to lighten the roofs,
or give the walls brownish tune
generally, those buildings are awesome.
It might be necessary to explain a bit on the construction of these buildings. The walls are predominantly whitewashed plaster (no modern paint), virtually appearing blinding against intense sunlight (at least that's what the old photos indicate, and that doesn't take into account moss and large amounts of black, accumulated dirt). The roofs are assumed to be made from clay/terra cotta, giving it a redish/brownish tone. If the walls have elements of unpainted wood or bricks (which use darker tones), the contrast shouldn't be as prevalent.

The best thing that can be done for now is lowering the brightness value of the white down by about 20 from a maximum of 240 and increasing the saturation to match the colour with the darker grays in the ramp. But if I go too low, it won't look like it's whitewashed anymore. The saturation of the roof colour can be lowered some more, but that brings us to the next issue...
Also I do agree about the contrast issue between houses and roofs - on the completely red roofs I get the feeling that they're not actually illuminated by the sun. Contrary to colour-saving tradition I'd say add a brighter colour : D for the parts of roof that are turned towards the sun.
As in using colour(s) with increased saturation?
Right now I feel the houses might be lacking in shading? I like the low contrast in the texture upon the buildings, but maybe some more contrast between light and shadow?
Since you brought up a needlessness to be too adherent to colour count, it's a good idea. A gray shade or two can be added to widen available options.