Jan's place is exactly as described - not well equipped, but very spacious. Its not a nice place, and we didn't really enjoy it, but it was perfect for what we needed. We wanted something close to both the train station and the old town and this definitely fit both those criteria. The bed was reasonably comfortable which, as I said, was all that really mattered for us.
One weird thing - apparently there are two Jans. A younger Jan met us to give us the keys, and an older Jan was in the apartment to collect the keys when we returned from sightseeing about 10 minutes before the checkout time.
If you're looking for a nice place, don't stay here. If you're looking for a place to sleep and leave your suitcase while exploring Prague and don't care about the quality, this is it.