low budget accomodation in Chinatown Bangkok

Couple things. Staying the entire time ONLY in Chinatown part of Bangkok?

Bangkok is a big city, roughly 600 square miles. Many tourists who visit Thailand for the first time often try to include a second city during their visit.

Chinatown is okay to visit but other parts of the city have access to city rail service.

If you are a student or around that age Khao San Road is a popular place to stay in. (My preference is a city location where I can use the Skytrain.)
http://www.urbanrail.net/as/bang/bangkok.htm

For hotel advice include a price range per night you want to stay at.

Read up on how to use meter taxis in Bangkok.

Chinatown:
http://www.bangkok.com/chinatown/
KSR - Khao San Road:
http://www.bangkok.com/area-khao-san-road/
Sukhumvit Nana-Asoke:
http://www.bangkok.com/sukhumvit/
(Skytrain available this area. Asoke also has a subway station.)

For Bangkok you could try a couple different parts of the city unless you are attending a school or some sort of training that is in Chinatown. Maybe visit another city for a day or two.

How much per night do you want to spend on a room each night in Thai baht? When will you visit Thailand? If Christmas-New Years time period that is high season for hotel prices.
Currency conversion link:
https://daytodaydata.net/

Come on back.

I have been many times in Bangkok and Thailand and all south east Asia in the past years (I was a tour leader); I am not going to visit or move around this time, It's just that I am going there now to write a book and part of it I want to write while staying in Chinatown and since it's 4-5 years I don't come back and before I used to go in mid-range hotels, I would have liked to have some advice from good experiences of some people who has been there recently for I would like to stay as comfortably as possible with a minimum expence (say between 10 and 20 €).
Thanks

(I was a tour leader) interesting with this question and buget 10E / night

Okay. Not the first time. (Being near a Skytrain stop does save you money on transportation.) But okay, so around 700 baht per night and only in Chinatown.

I only visit there every now and then. I kind of think it is boring during the evening hours.
Maybe one of the search engines for hotels can help.

Good luck.

This one was always a staple in Chinatown
https://www.tripadvisor.co.uk/Hotel_Review-g293916-d525797-Reviews-River_View_Guest_House-Bangkok.html

It is within your budget and might suit you. But Chinatown is becoming more gentrified and expensive now and if cost is an issue, you could get places one quarter of the price around KSR, then spend 16Baht on the boat down to Chinatown.

btw, you know that LP has a hotel booking/recommendations page, right?
https://www.lonelyplanet.com/thailand/bangkok/hotels/a/lod/357640?locations=1324180

Thank you very much Wonderingtsar2: actually this was the kind of answer I expected to have.
I know very well the River View, it's where I used to take the groups when was working; I like it and probably I'll end to go there again, but my enquiry was just to look for a cheaper alternative to it because I know that in BKK a good number of new guest hoses open every year, Chinatown was attracting increasingly more tourists when I used to go there and in these last 4 or 5 there could have been opened something interesting new (maybe in a less panoramic location in case).
KSR, yes, I know, but honestly.....it's not the place for me.
Thank you very much anyway

KSR has gone more upmarket in accommodation with prices to match.

KSR, yes, I know, but honestly.....it's not the place for me.
Thank you very much anyway

If its not the place for you then just don't stay on the road itself , KSR also refers to an area - Banglamphu not just the tourist strip. In other words you don't have to stay in another area just because you don't Khao San Rd the actual street .You can walk a few minutes away from Khao San rd past Tanao road then you are in a quiet area of guesthouses where you can find rooms for less than 150 baht in some cases. If you want bathroom it will cost more but if you can manage to do without then you can find rooms for 150 baht or less. Unless you have a particular reason for needing to stay in Chinatown then the Tanao rd area is your cheapest option.

Chinatowns are boring.