1. Hostels: London has a wide range of hostels offering budget-friendly accommodation for travelers. Some popular options include Generator Hostel, St Christopher's Inn, and YHA London Central.

2. Budget hotels: There are several budget hotels in London that offer affordable room rates without compromising on comfort. Examples include Premier Inn, Travelodge, and Ibis Budget.

3. Airbnb: Renting a room or apartment through Airbnb can be a cost-effective option for budget travelers in London. This allows you to stay in a local neighborhood and often provides more space and amenities compared to traditional hotels.

4. Guesthouses and B&Bs: There are many guesthouses and bed and breakfasts in London that offer affordable accommodation with a more personal touch. Websites like Booking.com and Expedia can help you find budget-friendly options in various areas of the city.

5. University accommodations: During summer months, some universities in London rent out their student dormitories to travelers at a discounted rate. This can be a budget-friendly option for those looking for basic accommodation in central locations.

here are my best budget places stay in London, Uk.

Wombats Hostel London
Hostelle London
Hostel One Notting Hill
Green Rooms London
Point A Hotels
Generator Hostel, London
B&B Belgravia
Abercorn House Hostel
Astor Museum Inn
Caring Hotel, London