Stayed here for 2 nights and felt a little deflated when we found the fridge didn't work and the shower was detached from the fixing. There was plenty of hot water though and plenty of sachets of shower gel and shampoo. The towels were clean and changed on both days.
At first glance we thought the bedspread was a bit grubby but in fairness it wasn't grubby it was just a very poor design which gave a grubby appearance! The sheets were clean and the beds were comfortable enough. In fact I slept very well. The room was small, as expected, but adequate for sleeping in, and had lots of power sockets. There was a small clothes hanging space with hangers and a small shelf with a large mirror. NO DRAWERS OR SHELVES FOR CLOTHES.
The breakfast room was small but if you timed it right as we did we always got a table without a wait. Fruit juice, muesli, cornflakes, a plate of rubbery slices of cheese, cold hard boiled eggs, white and brown bread (and toasters), butter and preserves, good coffee and mediocre tea bags. Enough to satisfy and keep one going but no cooked English breakfast, and it's a help yourself system.
I rang up 2 days before arriving to ensure they had honoured my request of a lower level room due to walking difficulties. They had overlooked my request but in fairness they did honour it and when we arrived we were shown to a ground level room.
It was quiet and very well situated for tube station and many shops, banks, post office, pubs, eating places etc and only a few minutes on the tube to the museums...so well potioned and very convenient.
Having stayed in a different hotel on the same street before I think I would rather pay a little more and have a slightly better grade of accomodation....but it did do for simply sleeping in. No luxury, simply basic.

St Mark Hotel in Earls Court is not great. Our visit was characterised by very indifferent service, no lift, an abysmal room (cabinets falling apart, filthy carpet, uncontrollably hot shower). The best thing about this hotel is that it is close to better hotels. It is cheap, but you get what you pay for. Almost.

We were not even booked 2 stay at this hotel and were moved here from another 1 we had previously booked. Upon arrival we were slightly early so asked could we put our luggage somewhere secure and were basically told to leave them in the corridoor downstairs unattended but they 'would be fine because they have cctv' when we said we wernt happy with that she assured us that once our room was available she would put our luggage in there (it was still unattended downstairs when we came back ) awful attitude and more interested in her book than to deal with paying customers, Room was ok 4 a quick overnight stay and great location 2 tube but will not be staying there again!

The room was incredible small (no wardrobe, no desk, no chair), we had a basement room with a lightwell window, breakfast was also in the basement and very crowed. Bathroom facilities were broken.
Staff was friendly.
The only advantage is the location (good neighborhood, close to tube, pubs and shops nearby)