The house is really nice and modern, very clean, with everything you need.
I haven't met Lenka personally, but a few weeks before the trip she sent us some really useful information about Prague.
David got in touch with us via whatsapp and viber the day before to arrange what time to meet, and he was really accommodating despite the fact we arrived a bit later than what I told him.
At our arrival he showed us the house, and he gave us some really useful tips on the town, recommending things to do and marking on the map places and bars we should visit.
The house is really comfortable, it wasn't too hot, although in the few days I was in Prague was really hot outside, and despite being adjacent to a large busy road with lots of traffic, it's well insulated and pretty much soundproof.
It has everthing you need, toaster, microwave, a coffee machine, a minibar, plenty of coffee and tea, a nice shower. It's probably worth mentioning that there isn't a stove, so you can't cook a proper meal (unless it's microwaveable), but that is not at all a lack. With so many nice places to eat and drink for cheap in Prague, why on Earth would you eat at home?!
The location is perfect, it's literally 5 minutes from the main train station, and 10-15 minutes from the main attractions. There are also a few convenience stores near the house.
I'd definitely stay again at their place, it's well worth the price. Absolutely recommend it.