I booked Marcel's place without seeing detailed pictures so it was little risky, but once I arrived, I was more than glad upon my choice. :)
So how not recommend???

Good!
- Combinient yet safe and cozy location
- Nice and cozy room
- Cool and kind host

Can be little trouble for someone?
- Stiff (but usual) dutch stair
- Regular (but pretty) church bell sound

1. Location, location, location!
15~25min (if look around a lot as I did) to Museumplein.
10 min to Dam square.
In front of Anne Frank's huis.
And just steps away from lots of adorable cafe, restaurant and shop. :)
And most of all, as a single female traveler wandering a lot, it really felt safe.

2. Neately decorated and even cozy room
Really loved the comfy bed and the windows full of light. Slept like a baby and enjoyed morning sunshine a lot.
Wooden floor, which I way prefer than carpet, gentle mood from neutral coloring with nice touch which is never too much.

3. Cool and kind host. :)
I usually don't make much conversation with host not to bother them much. However, this time, I couldn't help but bother my host more than usual as it was very pleasure to have little chat with Marcel. It was not only pleasant but also informative and useful conversation. He explained interesting stories about city and shared good tips for attractions.
(But in the most gentle way, he just informed what good points for each but nothing negative. :) )
And though of my early arrival, (and even on Sunday!) he welcomed me warmly and kindly showed place.

BTW, two points you may understand before booking.
As Marcel also mentioned, his place is on 2nd floor can be reached by stiff stairs only without lift.
But it's probably for most of dutch house so you'd be better pack luggage as light as possible, as you're coming to city (or land) of stiff stairs! ;)

Additional note for light sleepers.
Though his house is not very next neighbor of the Westerkerk (the cathedral nearby) it can be heard quite clearly when the bell rings.
I'm not a light sleeper and prefer peaceful church bell ringing than terrible noise from the street/traffic, so it was absolutely not a trouble for me. I rather enjoyed unique mood of being in another city.

So, all in all, unless you're having serious pain with knees, or terriblly light sleeper, it is absolutely recommended. :)