The apartment was very clean and we were able to store our bags there before check in which was a great help. The walk to the tube took about 15 minutes each way by a very busy road, quite challenging with children but fine for couples/adults.
From the outside the building is a bit of a shock and there is a concrete stairwell up to the third floor....it's not pretty, but the flat, although basic, is much nicer than you'd expect from the exterior.
We were a group of two adults. two children and an infant. There was no bed or linen for the infant which was a challenge, so I wouldn't recommend this flat for a group of 5. That said there were some toys and books for the children which was a really nice surprise.
All in all I'd say this is a reasonably good value basic apartment.