For those for whom Spanish is not a first language, Cristina's comments translate thus:
Martin is a wonderful, friendly, helpful, very friendly and very concerned about their guests host. The indications that Martin leaves you to the apartment, to move around the neighborhood and transportation are very useful and valuable. All very well explained to arrival. Besides Martin it is also pending the phone if you need to contact the at any time. It also gives recommendations to visit things in the city, which also shows an interest in your stay in the city is to your liking. The apartment is as shown in the pictures, very very comfortable, and very well equipped especially in the kitchen you find everything you need if you want to dine at home. Dishes, glasses, utensils, everything. In addition also it has always stuff in the pantry! that anytime you out of a jam. The very soft and comfortable beds. At night we put the heating and also very good. The apartment is in the district of Kensington, one of London's residential, with really nice houses, is a very quiet, without noise and bustle. The station is more closer to the apartment is practically in front Olimpya Kensington, it only works on weekends. (Now it is under construction and the branch is closed), but have two more subway station about 15 min walk. Buses also arrive therefore you do not stay incommunicado ever. The apartment also has WI FI, which today is almost indespensable requisite !, which is very useful for the traveler, because if you want to ask something on the internet and go without data enabled, because you can see what makes you lack when you're in the apartment. Everything is in very good condition and maintained, and very clean and really spacious. We were 6 and had plenty of room for everyone. That is also important. If you need to arrive or leave at a certain time outside the official time of booking, Martin will also help to enable you to arrive before or leave luggage at any given moment, which ... really a wonderful and very enjoyable., I recommend this apartment without any doubt and his terrific host that makes you all very easy.
And I think that 'es stupendo' needs no translation!