Unfortunately I haven't met Kristine personally, but the contact was easy and she answered questions quickly. Even after I had some trouble with water flooding in caused by very heavy rain she provided help without delay although she wasn't in Riga at the moment.
The flat itself is as described. It's a very unique place with all pros and cons.
If you like to stay in a nicely decorated room with medieval atmosphere it's a perfect space for you. The kitchen is small but it's fine for a coffee and a quick breakfast. Wifi was stable and quick, the audio system was great
My stay was in June with hot weather outside so the room in the cellar was good to get a refreshment as there's a constantly low temperature inside. I'm not sure how this will work out in winter times as the provided heaters as well as the fireplace doesn't manage to warm up the room properly. You should also be aware that there are no windows in the flat so all light that comes in is from the open door, everything else is electric light. I'm fine with it but I guess there are some people out there that will have a problem with it.
Please keep also in mind that there's a quite low ceiling which can be a bit tricky especially if you are taller than 1,80 m. In this case there can also be a problem with the sit-in shower.
I really enjoyed my four-night-stay but I guess I would choose a different location for a longer stay. For a short stay to explore beautiful Riga it's a perfect place as it's located directly in old town with only a five minute walt to the cathedral square.