Robert's place is very well located, close to Old Town Square, yet on a quieter street and with the windows closed, you'd sleep well.
Downstairs you've got Blatjica and closeby U modré kachničky II which did great dinners. On the next street is Venue which is great for brunch. A bunch of good good coffee shops are also around, and so are some convenience stores. The Anonymous bar is super close, and the Alchemist bar is 5 mins away - both do great cocktails.
As mentioned, Old Town Square is closeby, and Charles Bridge is about 10 minutes. I enjoy walking and was able to see pretty much everything on foot!
The train station (the one I came to from Vienna) is about 15-20 minute walking, and the subway is less than 5 minutes. There are many stores, for all kind of shopping and needs, and they're all 5-10 minutes walking.
Now to the apartment, it's spacious and very well equipped with anything you'd need. I was there for a week, and it met all my needs (washer, internet, cooking range etc.). There is an elevator in the building.
Robert is a nice and friendly person and was always super responsive.
Thanks, Robert, and I hope to cross paths again.