Stayed in a twin room with ensuite. Room was small but clean, and the beds firm but not uncomfortable. Double glazing kept traffic noise to a minimum. We were on the top floor - there are 50 steps to get up from the entry level, 65 from the dining room, so tricky for the less able bodied. Bathroom was very clean and the shower worked well, as did the TV, kettle and hairdryer provided. Proprietors were very friendly and amenable, kindly allowing us to leave our bags with them as out train home wasn't until mid-afternoon. Breakfast was 7.30-9am, good choice of cereals, continental or a lovely English breakfast which sets you up nicely. Kings Cross/St Pancras station is really close and Euston is about a 10 min walk away. HSBC and Barclays bank also very close by. Tussards is a 30 min walk away and all sorts close from there so check walking routes before fighting with the underground. Day travel pass for zones 1&2 is £6.60 - AFTER 9.30am, more expensive before, and it's manic. All in all, a comfortable stay with good food and pleasant owners!

We used this hotal as an overnight stop over for Eurostar for which the location is ideal. The reception was friendly and helpfull and seems to double as a living room! We were on the top floor with 3 flights of stairs which would prove difficult for anybody less mobile. The room was tiny, with a 3/4 double bed and a tiny en-suite, but it was clean and had everything we needed. It's a fairly quiet area with only the constant distant noises of sirens that continue 24/7 in London to be heard. Breakfast was excellent with very courteous waiting at the tables. There are plenty of good restaurants nearby, but we went for local pub grub which proved better than the meals we had later in Paris! We would be happy to use this hotel again in future.

Nothing fancy but then it doesn't pretend to be. Stayed here when i went to a gig in Highbury and although the room was small and right at the top of the building it was spotlessly clean and tidy and very comfortable.
Breakfast the next day was plentiful and tasty (choice of full english or continental) and the staff were cheerful and polite. What more do you want for a budget stay in London?

Apollo Hotel is a B&B in my own category. The whole stretch of Argyle St is full of B&Bs. It is simple, basic, but it meets the simple needs of London tourists who will not spend so long time in their rooms when in the city. The staff are friendly and helpful. Two choices for breakfast: full English and continental. There are coffee and tea available in the rooms, as well as TV. The room sizes are indeed small, maybe a little too tight but it is not that horrible if there two average size people moving around.

Some tips: ask for room in lower floors to avoid carrying your luggage all the way up, there is no lift; avoid basement room; the en-suite room is more convenient but it costs extra £10-20/night; if you can eat heavy breakfast and want to save money, take it in Apollo.

Price is, more often than not, directly proportional to the service and quality of hotel. I think people who chose Apollo chose it for the price and location in King's Cross. If you pay Marriott or Four Seasons, you get Marriott or Four Seasons. If you pay Apollo price level, you can get relatively clean bedroom, clean bathrooms, OK breakfast, friendly service - isn't that a good deal for your £?

PS For Harry Potter lovers, try to find the 9 3/4 platform in King's Cross, it si an attraction by itself. The hop-on, hop-off is good for those with very limited time in London.