Tomas and Jitka's apartment is exactly as described on the website and they are very accommodating. If you need, it is very easy to contact them as they live just beside the spot itself.
I came to Prague for a wedding and having this housing was great! It's right across from Rigerovy Sady which is a lovely park, close to many off-the-beaten-path restaurants, and just a mile walk from Old Town Square! It's very easy to take the metro (just around the corner) or a taxi or any other public transport as well.
The cleanliness is top notch!
In summation, it's close enough for you to do Prague right, and far enough that you can have relaxing and quiet moments as well. I found myself referring to it as "home" while I was there. Thanks! :)