We really enjoyed the week we spent in Martijn's tiny house. It had everything we needed, was clean and comfortable, and Martijn was very helpful and communicated quickly. The use of the bikes (which Martijn kindly adjusted for us!) made a huge difference - Den Haag is very well designed for cycling, and despite not having cycled regularly for years (and never in the Netherlands) we were quickly exploring the city and even went as far as Delft.
There are loads of food shops within easy reach, and the train station is only about 20 minutes' bike ride away so Amsterdam and Rotterdam are both very reachable too (we visited both). Thoroughly pleasant all round, and we would definitely want to come back.