We stayed in this apartment as a family of 4, one of which needed a travel crib. The travel crib was in the apartment when we arrived which was great. However, there is not a ton of room to set it up. There is one bed plus a sofa bed that pulls out. The sofa bed has a bar in the middle of it which makes it less than desirable. So I would really recommend this apartment only for a couple or single traveler who could use the regular bed. It is doable with the sofa bed, but whoever sleeps on it will be significantly less comfortable. The apartment was in decent condition and pretty clean. The kitchen has some things but is not super equipped if you plan to do cooking. We did not do any major cooking so it was fine for us. There are also a lot of stairs and no elevator so this is a little tricky with strollers and large bags.
On the plus side, this stay is in an excellent location near King's Cross. There is easy access to the tube. There are also several grocery stores and restaurants/coffee shops within short walking distance. The location worked really well for us.