Pier answered every question I asked precisely and nicely. Indeed he was an excellent host that I've never met before.
The distance to the center of Edinburgh is a little too far to walk with heavy baggage. We took a bus(23 or 27) instead and saved our energy to shop. The route of the bus was simple.
The flat was clean and cozy. The utensils in the kitchen were compact, which made cooking very convenient. As for the surrounding, it was very quiet with beautiful view to enjoy when I took an evening walk. Super store of Tesco, various restaurants, and the Royal Botanic Garden were easy to reach by walking. Generally speaking, the trip was great.
I will book Pier's flat if visiting with my family again.