Murder victim Vasilijs Ransevs was a quiet, shy man who moved to Lincolnshire for a better life, according to his landlord.
The 33-year-old Latvian, who died from a head injury, was described as hardworking and reliable by businessman Mark Dore.
The tribute came as police hunting his killer appealed to the city's Eastern European communities for help.
Officers are handing out posters in five languages – Lithuanian, Latvian, Polish, Russian and Kurdish – urging anyone with information to come forward.
Mr Ransevs, a Latvian land worker, was last seen on Friday, June 14. A friend found his body at his flat in Portland Street, Lincoln, two days later.
Following a post-mortem, police have now launched a murder investigation.
Mr Dore told the Echo he was shocked by the killing.
"He was a nice guy. He was very quiet and shy and kept himself to himself," he said.
"He was a great tenant and an all round nice bloke. He was well behaved and kept the place very clean and tidy.
"It is terrible that he came over here for a better life and it has ended up a short one.
"When I was told who it was I couldn't believe it."
Mr Dore said he had known Mr Ransevs for about two years through renting him one of five flats in the building.
Mr Dore said it was a tragedy that somebody had died so young.
"I have known him for about as long as he has been in Lincoln," he said.
"He didn't seem to ever have too many visitors and I rarely saw him with anyone else. He certainly wasn't a yob or a troublemaker, that is for sure.
"It is terribly sad news that somebody has died so young. We have some dodgy characters here and there but he was not one of them."
A team of 25 officers is now working to catch his killer.
Detective Superintendent Stuart Morrison is the senior investigating officer.
He said: "We want to build a better picture of Mr Ransevs and want information of his whereabouts and activity between June 12 and 16.
"We want anybody who knew Mr Ransevs or anybody with any information as to his whereabouts between June 12 and 16 to contact us."
The shy, young Latvian who lay dead for hours... p6-7