Everything about this home ticks all the boxes to me. A one bedroom house, great flowing floorplan with a courtyard and the location. With a few little tweeks, this is also what it to grow to be. (Sold - $620k)
I would paint all the floor boards glossy black and then paint the walls a light pastel colour like the below.
The bedroom, I would try to replicate this look.
For the bathroom and kitchen, it would seem the black and white tiles cover both. So until I could afford to re-do them, I would keep them and work the rooms as follows:
For the bathroom,
For the kitchen, I would paint the cabinets grey glossy and add gold fittings. Also add a industrial type light for above the table, which would be an old antique wood. Like the doors below that go into the cellar, I would add the same, but out into the courtyard.
The garden would need a bit of work, but would look great as follows.