This is overall a great place with an excellent central location. Lenka is an excellent host, and was very responsive to our needs and requests. It was clean and matched the description and photos that were posted, and was a great stepping-off point to explore the Old Town. It also had a very comfy bed, which was greatly appreciated.
As others have mentioned, the wi-fi was marginal, and only seemed to allow a single device to reliably connect at a time. Lenka kindly came by and asked the neighbors, in whose apartment the router apparently resides, to reset the connection, and this helped briefly but unfortunately it soon went back to the flaky behavior. We were able to mitigate this by using a hotspot on my phone to rebroadcast the wi-fi for other devices, which worked great throughout the stay.
During our stay the shower did not drain well and leaked at several points underneath the shower walls and door, flooding the bathroom floor on a couple of occasions and resulting in a wet musty odor, but we brought this up with the hosts and it has hopefully been addressed now. There were also a couple of small issues that were outside the control of the hosts, such as construction going on in the apartment above and the occasional loud drunken person on the street just outside the bedroom window, which sometimes made it difficult to sleep at certain times of the night and morning.
All that said, this apartment is a good choice for a home base, particularly if you plan to be out exploring the city during the day. It's an excellent value for the location, and Lenka is a kind and accommodating host.