Wow - fantastic apartment, very large and solid. The description in the listing is accurate, but as another reviewer mentioned, the apartment is actually larger than it looks in the photos. The bedroom and the lounge doors both had keys and are separate doors off the spacious hallway that leads through the apartment so it would be easy to share the accommodation and still have privacy. There is a TV in every room (bedroom, lounge and kitchen) and a piano in the lounge for the musically minded. I was there on my own and barely used the lovely lounge room, I ate in the kitchen and generally ended up sitting in there working on my laptop on the kitchen bench, it was cosy in there.
The location was good, a short walk to Central Market (a must to visit), the bus and train stations, and shops including supermarkets. The old town is close to Central Market, maybe a 10 minute walk from the apartment, very close. If you get lost, the apartment is very close to the tall Academy of Sciences building which you can use as a landmark.
I didn't meet Natalja but she provided very accurate instructions to collect the keys and there were no issues checking in or out.